• Quantum Computations and Information Sciences
• Quantum Information Theory:
• Quantum Shannon Theory
• Properties of capacities for quantum channels
• Monogamy of entanglement
• Bound entanglement and Bell inequalities
• Entanglement and entanglement measures
• Quantum Communication Theory:
• Quantum communication and bound entanglement
• Quantum key distribution protocols and security proofs
• Quantum secret sharing schemes
• Quantum error-correcting codes
• Quantum Algorithms:
• (Recursive) quantum approximate optimization algorithms
• Separation between shallow quantum/classical circuits
• Hidden subgroup problems
• Initialization-free algorithms
• Quantum complexity theory

Publications

• "Genuine multipartite entanglement measures based on multi-party teleportation capability" (with Minjin Choi and Eunok Bae), Scientific Reports, Vol. 13, 15013 (2023); e-print Archive, arXiv:2211.15986, 2022.
• "Recursive QAOA outperforms the original QAOA for the MAX-CUT problem on complete graphs" (with Eunok Bae), Quantum Information Processing, Vol. 23, 78 (2024); e-print Archive, arXiv:2211.15832, 2022.
• "Quantum advantage through the magic pentagram problem" (with Haesol Han, Jeonghyeon Shin, Minjin Choi and Byung Chan Kim), Quantum Information Processing, Vol. 21, 334 (2022); e-print Archive, arXiv:2209.15188, 2022.
• "Relation between quantum coherence and quantum entanglement in quantum measurements" (with Ho-Joon Kim), Physical Review A, Vol. 106, 022401 (2022); e-print Archive, arXiv:2202.12656, 2022.
• "Quantum cryptographic resource distillation and entanglement" (with Minjin Choi), Scientific Reports, Vol. 11, 21095 (2021); e-print Archive, arXiv:2110.13707, 2021.
• "Quantum algorithm for solving the continuous hidden symmetry subgroup problem" (with Eunok Bae), IEEE Access, Vol. 9, 93248 (2021).
• "One-shot static entanglement cost of bipartite quantum channels" (with Ho-Joon Kim), Physical Review A, Vol. 103, 062415 (2021); e-print Archive, arXiv:2103.10014, 2021.
• "One-shot manipulation of entanglement for quantum channels" (with Ho-Joon Kim, Ludovico Lami and Martin B. Plenio), IEEE Transactions on Information Theory, Vol. 67, 5339-5351 (2021); e-print Archive, arXiv:2012.02631, 2020.
• "Quantum state rotation: Circularly transferring quantum states of multiple users" (with Yonghae Lee and Hayata Yamasaki), Physical Review A, Vol. 103, 062613 (2021); e-print Archive, arXiv:2009.11539, 2020.
• "Genuine secret-sharing states" (with Minjin Choi), Quantum Information Processing, Vol. 20, 47 (2021); e-print Archive, arXiv:2008.06202, 2020.
• "Generalization of port-based teleportation and controlled teleportation capability" (with Kabgyun Jeong and Jaewan Kim), Physical Review A, Vol. 102, 012414 (2020); e-print Archive, arXiv:2002.12651, 2020.
• "One-shot quantum state exchange" (with Yonghae Lee, Hayata Yamasaki and Gerardo Adesso), Physical Review A, Vol. 100, 042306 (2019); e-print Archive, arXiv:1905.12332, 2019.
• "Quantum algorithm based on the ε-random linear disequations for the continuous hidden shift problem" (with Eunok Bae), Quantum Information Processing, Vol. 20, 347 (2021); e-print Archive, arXiv:1904.06225, 2019.
• "Upper bounds on the quantum capacity for general attenuator and amplifier" (with Youngrong Lim, Jaewan Kim and Kabgyun Jeong), Physical Review A, Vol. 99, 052326 (2019); e-print Archive, arXiv:1903.04728, 2019.
• "Activation and superactivation of single-mode Gaussian quantum channels" (with Youngrong Lim, Ryuji Takagi and Gerardo Adesso), Physical Review A, Vol. 99, 032337 (2019); e-print Archive, arXiv:1901.03147, 2019.
• "State exchange with quantum side information" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki and Gerardo Adesso), Physical Review Letters, Vol. 122, 010502 (2019); e-print Archive, arXiv:1809.07030, 2018.
• "Hybrid quantum linear equation algorithm and its experimental test on IBM Quantum Experience" (with Yonghae Lee and Jaewoo Joo), Scientific Reports, Vol. 9, 4778 (2019); e-print Archive, arXiv:1807.10651, 2018.
• "Activation of the quantum capacity of Gaussian channels" (with Youngrong Lim), Physical Review A, Vol. 98, 012326 (2018); e-print Archive, arXiv:1803.04230, 2018.
• "Maximally entangled states in discrete and Gaussian regimes" (with Youngrong Lim, Jaewan Kim and Kabgyun Jeong), Quantum Information Processing, Vol. 18, 43 (2019); e-print Archive, arXiv:1801.08296, 2018.
• "Research trends in quantum computational algorithms for cryptanalysis" (Korean) (with Eunok Bae and Jeong San Kim), Korean Journal of Optics and Photonics, Vol. 29, 53 (2018).
• "Quantum secret sharing and Mermin operator" (with Minjin Choi and Yonghae Lee), Quantum Information Processing, Vol. 17, 258 (2018); e-print Archive, arXiv:1712.07819, 2017.
• "Conditional quantum entropy power inequality for d-level quantum systems" (with Kabgyun Jeong and Hyunseok Jeong), Journal of Physics A: Mathematical and Theoretical, Vol. 51, 145303 (2018); e-print Archive, arXiv:1706.08742, 2017.
• "Forgeable quantum messages in arbitrated quantum signature schemes" (with Taewan Kim and Hyang-Sook Lee), Quantum Information Processing, Vol. 16, 268 (2017); e-print Archive, arXiv:1708.05111, 2017.
• "State transfer with quantum side information" (with Yonghae Lee), Quantum Information Processing, Vol. 17, 268 (2018); e-print Archive, arXiv:1708.04088, 2017.
• "Stability theorem of depolarizing channels for the minimal output quantum Renyi entropies" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), Journal of Physics A: Mathematical and Theoretical, Vol. 49, 115304 (2016); e-print Archive, arXiv:1510.07815, 2015.
• "Quantum nonsignalling-assisted zero-error classical capacity of qubit channels" (with Jeonghoon Park), Physical Review A, Vol. 93, 032334 (2016); e-print Archive, arXiv:1510.05816, 2015.
• "Minimal control power of the controlled teleportation" (with Kabgyun Jeong and Jaewan Kim), Physical Review A, Vol. 93, 032328 (2016); e-print Archive, arXiv:1509.05165, 2015.
• "Concentrating tripartite quantum information" (with Alexander Streltsov and Gerardo Adesso), Physical Review Letters, Vol. 115, 030505 (2015); e-print Archive, arXiv:1410.6346, 2014.
• "Quantum messages with signatures forgeable in arbitrated quantum signature schemes" (with Taewan Kim, Jeong Woon Choi and Nam-Su Jho), Physica Scripta, Vol. 90, 025101 (2015); e-print Archive, arXiv:1407.1380, 2014.
• "Strong monogamy conjecture for multiqubit entanglement: The four-qubit case" (with Bartosz Regula, Sara Di Martino and Gerardo Adesso), Physical Review Letters, Vol. 113, 110501 (2014); e-print Archive, arXiv:1405.3989, 2014.
• "Quantum computational algorithm for hidden symmetry subgroup problems on semi-direct product of cyclic groups" (with Jeong San Kim and Eunok Bae), e-print Archive, arXiv:1307.1183, 2013.
• "Peres-Wootters measurement for three nonorthogonal states" (with Hyunmin Jeong, Yonghae Lee and Hyeona Lim), International Journal of Theoretical Physics, Vol. 53, 807-814 (2014).
• "Zero-error classical capacity of qubit channels cannot be superactivated" (with Jeonghoon Park), Physical Review A, Vol. 85, 052321 (2012); e-print Archive, arXiv:1205.5851, 2012.
• "Bound on remote preparation of entanglement from isotropic states", Physical Review A, Vol. 85, 052311 (2012); e-print Archive, arXiv:1205.3970, 2012.
• "Separable states to distribute entanglement" (with Jeonghoon Park), International Journal of Theoretical Physics, Vol. 51, 1100-1110 (2012); e-print Archive, arXiv:1012.5162, 2010.
• "Efficient three-to-one entanglement purification protocol" (with Dong Pyo Chi and Taewan Kim), Physics Letters A, Vol. 376, 143-146 (2012).
• "Constraint on teleportation over multipartite pure states" (with Jeong San Kim and Jaewoo Joo), European Physical Journal D, Vol. 65, 593-596 (2011); e-print Archive, arXiv:1010.3936, 2010.
• "A simple augmented Jacobi method for Hermitian and skew-Hermitian matrices" (with Chohong Min and Se-Goo Kim), Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics, Vol. 18, 185-199 (2011).
• "Extension of the GHJW theorem for operator ensembles" (with Jeong Woon Choi, Dowon Hong, Ku-Young Chang, and Dong Pyo Chi), Physics Letters A, Vol. 375, 430-433 (2011).
• "Distribution and dynamics of entanglement in high-dimensional quantum systems using convex-roof extended negativity" (with Jeong San Kim and Barry C. Sanders), Physics Letters A, Vol. 375, 411-414 (2011); e-print Archive, arXiv:1006.0750, 2010.
• "Bound on distributed entanglement" (with Jeong San Kim), Journal of Physics A: Mathematical and Theoretical, Vol. 43, 385305 (2010); e-print Archive, arXiv:1001.5453, 2010.
• "Concurrence of assistance and Mermin inequality on three-qubit pure states" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), Physical Review A, Vol. 81, 044302 (2010); e-print Archive, arXiv:0909.5316, 2009.
• "Multipartite bound entanglement and multi-setting Bell inequalities" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), Physical Review A, Vol. 80, 032330 (2009); e-print Archive, arXiv:0904.4818, 2009.
• "Monogamy of entanglement and teleportation capability" (with Jungjoon Park), Physical Review A, Vol. 79, 054309 (2009); e-print Archive, arXiv:0905.0742, 2009.
• "Non-static quantum bit commitment", (with Jeong Woon Choi, Dowon Hong, Ku-Young Chang, and Dong Pyo Chi), e-print Archive, arXiv:0901.1178, 2009.
• "Any multipartite entangled state violating the Mermin-Klyshko inequality can be distilled for almost all bipartite splits", (with Jinhyoung Lee and Jaewan Kim), Physical Review A, Vol. 79, 032309 (2009); e-print Archive, arXiv:0807.4396, 2008.
• "Quantum states for perfectly secure secret sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), Physical Review A, Vol. 78, 012351 (2008); e-print Archive, arXiv:0804.4797, 2008.
• "Monogamy equality in 2 x 2 x d quantum systems" (with Dong Pyo Chi, Jeong Woon Choi, Kabgyun Jeong, Jeong San Kim, and Taewan Kim), Journal of Mathematical Physics, Vol. 49, 112102 (2008); e-print Archive, arXiv:0804.0181, 2008.
• "Three methods to distill multipartite entanglement over bipartite noisy channels" (with Jungjoon Park), Physics Letters A, Vol. 372, 3157-3161 (2008).
• "Three party d-level quantum secret sharing protocol" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), Journal of Physics A: Mathematical and Theoretical, Vol. 41, 255309 (2008); e-print Archive, arXiv:0801.0177, 2008.
• "Teleportation capability, distillability, and nonlocality on three-qubit states" (with Jaewoo Joo and Jaewan Kim), Physical Review A, Vol. 76, 012311 (2007); e-print Archive, quant-ph/0702247, 2007.
• "Bound entangled states with nonzero distillable key rate" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), Physical Review A, Vol. 75, 032306 (2007); e-print Archive, quant-ph/0612225, 2006.
• "Quantum algorithms for the hidden subgroup problem on some semi-direct product groups by reduction to abelian cases" (with Dong Pyo Chi and Jeong San Kim), Physics Letters A, Vol. 359, 114-116 (2006); "Notes on the hidden subgroup problem on some semi-direct product groups" (with Dong Pyo Chi and Jeong San Kim), e-print Archive, quant-ph/0604172, 2006.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), Physical Review Letters, Vol. 95, 080504 (2005); e-print Archive, quant-ph/0504173, 2005.
• "Entanglement of three-qubit pure states in terms of teleportation capability" (with Jaewoo Joo and Jaewan Kim), Physical Review A, Vol. 72, 024302 (2005); e-print Archive, quant-ph/0502157, 2005.
• "Quantum key distribution based on conference key agreement" (with Sora Choi and Dong Pyo Chi), Trends in Mathematics, Vol. 8, 189-195 (2005).
• "Secure quantum communication for secret sharing" (with Dong Pyo Chi, Sora Choi, and Jaewan Kim), Trends in Mathematics, Vol. 8, 145-154 (2005).
• "Quantum secret sharing over GF(p^r)" (with Dong Pyo Chi), Bulletin of Research Institute for Basic Sciences, Vol. 1, 31-42 (2004).
• "Secure quantum cryptographic network based on quantum key distribution" (with Sora Choi and Dong Pyo Chi), e-print Archive, quant-ph/0403172, 2004.
• "Faithful sharing of multipartite entanglement over noisy channels" (with Sora Choi and Dong Pyo Chi), Journal of the Korean Physical Society, Vol. 45, 1119-1122 (2004); e-print Archive, quant-ph/0312223, 2003.
• "Entanglement swapping secures quantum multiparty communications" (with Juhui Lee, Jaewan Kim, and Sung Dahm Oh), Physical Review A, Vol. 70, 032305 (2004); e-print Archive, quant-ph/0309185, 2003.
• "Convex-roof extended negativity as an entanglement measure for bipartite quantum systems" (with Dong Pyo Chi, Sung Dahm Oh, and Jaewan Kim), Physical Review A, Vol. 68, 062304 (2003); e-print Archive, quant-ph/0310027, 2003.
• "Entanglement for a two-parameter class of states in 2 x n quantum system" (with Dong Pyo Chi), Journal of Physics A: Mathematical and General, Vol. 36, 11503-11511 (2003); e-print Archive, quant-ph/0309073, 2003.
• "Quantum functional oracles" (with Jinsoo Kim and Dong Pyo Chi), Journal of Physics A: Mathematical and General, Vol. 35, 6911-6917 (2002); "Function-dependent phase transform" (with Dong Pyo Chi and Jinsoo Kim), e-print Archive, quant-ph/0006039, 2000.
• "Quantum MDS Codes" (with Dong Pyo Chi, Jinsoo Kim, and Jeyhoon Lee), Preprint, 2001.
• "Initialization-free generalized Deutsch-Jozsa algorithm" (with Dong Pyo Chi and Jinsoo Kim), Journal of Physics A: Mathematical and General, Vol. 34, 5251-5258 (2001); "Quantum Algorithm for Generalized Deutsch-Jozsa Problem" (with Dong Pyo Chi and Jinsoo Kim), e-print Archive, quant-ph/0005059, 2000.
• "On quantum computational algorithms", Ph. D. Thesis, Seoul National University, 2002.

Patents

• Kabgyun Jeong and Soojoon Lee, "System and Method for Port-based Controlled Quantum Teleportation", Korea Patent (App. No. 10-2020-0156056, Nov. 19, 2020; Patent No. 10-2381049, Mar. 31, 2022).
• Nam-Su Jho, Soojoon Lee, and Taewan Kim, "Quantum Signature Method using Arbitrator and System using it", Korea Patent (App. No. 10-2012-0126601, Nov. 9, 2012; Pub. No. 10-2014-0060022, May 19, 2014).
• Jeong Woon Choi, Ku-Young Chang, Dong Pyo Chi, Soojoon Lee, Kabgyun Jeong, and Taewan Kim, "Quantum Authentication Method and Apparatus for Quantum Secret Sharing Protocol", Korea Patent (App. No. 10-2010-0133609, Dec. 23, 2010; Pub. No. 10-2012-0071883, July 3, 2012).
• Jeong Woon Choi, Ku-Young Chang, Tae-Gon Noh, Dong Pyo Chi, and Soojoon Lee, "Method and Apparatus for Authentication User in Multiparty Quantum Communications", Korea Patent (App. No. 10-2010-0033400, Apr. 12, 2010; Pub. No. 10-2011-0070694, Jun. 24, 2011; Patent No. 10-1351012, Jan. 2, 2014).
• Jeong Woon Choi, Ku-Young Chang, Dowon Hong, Dong Pyo Chi, and Soojoon Lee, "Method for process of non-static quantum bit commitment", Korea Patent (App. No. 10-2009-0119722, Dec. 4, 2009; Pub. No. 10-2011-0062869, Jun. 10, 2011).
• Sora Choi, Soojoon Lee, and Dong Pyo Chi, "Quantum key distribution network between multiusers or various groups", US Patent (App. No. 10/984084, Nov. 8, 2004; Pub. No. US 2005/0249352 A1, Nov. 10, 2005; Patent No. US 7,496,203 B2, Feb. 24, 2009) and Korea Patent (App. No. 10-2004-0025246, Apr. 13, 2004; Pub. No. 10-2005-0100074, Oct. 18, 2005; Patent No. 10-0596404, Jun. 27, 2006).

Conference Talks/Posters

(Speaker: Lee, Soojoon)
• "Shallow quantum-circuit algorithm", presented at Quantum Information Conference 2020 (Seoul National University, Seoul, Korea), August 2020.
• "Quantum state exchange with quantum side information" (with Yonghae Lee), presented at KMS 2019 Autumn Conference: the biannual (Autumn) Conference of the Korean Mathematical Society (Hongik University, Seoul, Korea), Oct. 2019.
• "Quantum state exchange and its entanglement cost" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki and Gerardo Adesso), presented at International Conference on Quantum Computing 2019 (Seoul, Korea), July 2019.
• "Entanglement cost for quantum state exchange can be negative" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki and Gerardo Adesso), presented at Quantum Information Conference 2019 (Sungkyunkwan University, Suwon, Korea), June 2019.
• "Quantum State Exchange and Entanglement Cost" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki and Gerardo Adesso), presented at COOC 2019: The 26th Conference on Optoelectronics and Optical Communications (Pusan, Korea), June 2019.
• "Quantum Information Theory and Quantum Communication", presented at 2017 KICS School on Quantum Communication and Quantum Computer (Korea University, Seoul, Korea), August 2017.
• "Introduction to Quantum Information Theory", presented at 2016 KICS School on Quantum Communication and Quantum Computer (Korea University, Seoul, Korea), August 2016.
• "Introduction to Quantum Cryptography and Quantum Computation", presented at 2016 NIMS School on Cryptography (National Institute for Mathematical Sciences, Daejeon, Korea), June 2016.
• "Security proof of quantum key distribution", presented at 2016 Quantum ICT Tech Symposium (Convention Hall at Konjiam Resort, Korea), May 2016.
• "Stability theorem of the depolarizing channel for the output quantum Renyi entropies" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), presented at MAQIT: Mathematical Aspects in Current Quantum Information Theory (National Institute for Mathematical Sciences, Daejeon, Korea), February, 2016.
• "Stability theorem of the depolarizing channel for the minimal output quantum Renyi entropy" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), presented at 2015 Korea-US Joint Workshop on Quantum Information (Korea Institute for Advanced Study, Seoul, Korea), November 2015.
• "Concentrated information of tripartite quantum states" (with Alexander Streltsov and Gerardo Adesso), presented at Minisymposium "Quantum Computation and Quantum Information", ICIAM 2015: The 8th International Congress on Industrial and Applied Mathematics (China National Convention Center, Beijing, China), August 2015.
• "Introduction to Quantum Cryptography", presented at 2015 NIMS School on Cryptography (National Institute for Mathematical Sciences, Daejeon, Korea), June 2015.
• "Quantum algorithms for the hidden subgroup problem", presented at 2015 NIMS School on Applied Algebraic Geometry (National Institute for Mathematical Sciences, Daejeon, Korea), April 2015.
• "Concentrated information of tripartite quantum states" (with Alexander Streltsov and Gerardo Adesso), presented at 6th KIAS Combinatorics Workshop (Korea Institute for Advanced Study, Seoul, Korea), December 2014.
• "Quantum Signature Schemes for Quantum Messages" (with Taewan Kim, Jeong Woon Choi and Nam-Su Jho), presented at Workshop on Quantum Communications and Cryptographic Technologies (Korea University, Seoul, Korea), October 2012.
• "Qubit Channels and Superactivation of Zero-error Classical Capacity" (with Jeonghoon Park), presented at The 7th Jikji-Workshop: Infinite Dimensional Analysis and Quantum Probability (Chungbuk National University, Cheongju, Korea), July 2012.
• "Quantum Fourier sampling and McEliece cryptosystem", presented at KMS 2012 Spring Conference: the biannual (spring) Conference of the Korean Mathematical Society (Sookmyung Women's University, Seoul, Korea), April 2012.
• "Grover's Search and Shor's Factoring Algorithms", presented at 8th "Open KIAS" Winter School on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), January 2012.
• "Optimal entanglement distribution", presented at KMS 2011 Fall Conference: the biannual (fall) Conference of the Korean Mathematical Society (Kyungpook National University, Daegu, Korea), October 2011.
• "Distribution and dynamics of entanglement in high-dimensional quantum systems" (with Jeong San Kim and Barry C. Sanders), presented at KIAS 2010 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2010.
• "Introduction to quantum algorithms", presented at Quantum Information Summer School (Hanyang University, Seoul, Korea), August 2010.
• "Partial transposition and quantum entanglement", presented at Quantum Information Science for Mathematicians (Korea Institute for Advanced Study, Seoul, Korea), July 2009.
• "Multipartite states violating Bell's inequality have many distillable bipartite splits" (with Jinhyoung Lee and Jaewan Kim), presented at AQIS'08: 8th Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2008.
• "Quantum algorithms and the hidden subgroup problem", presented at KIAS Winter School on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), February 2008.
• "Teleportation capability, distillability, and nonlocality on three-qubit states" (with Jaewoo Joo and Jaewan Kim), presented at KIAS-KAIST 2007 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), June 2007.
• "Quantum algorithms for the hidden subgroup problem" (with Dong Pyo Chi and Jeong San Kim), presented at the biannual (spring) meeting of the Korean Mathematical Society (Donga University, Busan, Korea), April 2006.
• "Quantum algorithms for the hidden subgroup problem", presented at KIAS Winter School on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), February 2006.
• "Mathematical aspect of entanglement", presented at KIAS Winter School on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), January 2005.
• "Entanglement of three-qubit pure states in terms of teleportation capability" (with Jaewoo Joo and Jaewan Kim), presented at KIAS-KAIST 2004 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2004.
• "Secure quantum communication for secret sharing" (with Dong Pyo Chi, Sora Choi, and Jaewan Kim), presented at 24th Daewoo Mathematics Workshop on Cryptography (Seoul National Uinversity, Seoul, Korea), July 2004.
• "Secure quantum communication between N partners for secret sharing" (with Sora Choi and Dong Pyo Chi), presented at the biannual (spring) meeting of the Korean Mathematical Society (Sungkyunkwan University, Suwon, Korea), May 2004.
• "Convex-roof extended negativity as an entanglement measure for bipartite quantum systems" (with Dong Pyo Chi, Sung Dahm Oh, and Jaewan Kim), presented at EQIS 2003: ERATO Conference on Quantum Information Science (Kyoto, Japan), September 2003.
• "Entanglement and entanglement measures" (with Dong Pyo Chi, Sung Dahm Oh, and Jaewan Kim), presented at KIAS-KAIST 2003 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2003.
• "Entanglement and permutation group" (with Dong Pyo Chi), presented at 2002 Workshop on Quantum Information Science (Korea Advanced Institute of Science and Technology, Daejon, Korea), August 2002.
• "Initialization-free generalized Deutsch-Jozsa algorithm" (with D. P. Chi, J. Kim, K. Ha, J. Jang and S. Chee), presented at EQIS 2001: ERATO Workshop on Quantum Information Science (University of Tokyo, Tokyo, Japan), September 2001.
• "Quantum algorithm distinguishing between even and constant distributions" (with Dong Pyo Chi and Jinsoo Kim), presented at Workshop on Quantum Information (Cheonan, Korea), August 2001.
• "Quantum secret sharing over Galois field" (with Dong Pyo Chi, Jinsoo Kim, and Sangkyum Kim), presented at Com2MaC Workshop on Cryptography (Pohang University of Science and Technology, Pohang, Korea), June 2000.

(Speaker: Bae, Eunok)
• "Stability theorem of depolarizing channels for the minimal output quantum Renyi entropies" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), presented at Minisymposium "Quantum Computation and Quantum Information", ICIAM 2015: The 8th International Congress on Industrial and Applied Mathematics (China National Convention Center, Beijing, China), August 2015.
• "Stability theorem for the minimal output quantum Renyi entropies" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), presented at 2014 KSIAM Annual Meeting (International Convention Center, Jeju, Korea), November 2014.

(Speaker: Chi, Dong Pyo)
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at SNU-HU 3rd Joint Symposium on Mathematics (SNU, Seoul, Korea), October 2005.
• "Initialization-free generalized Deutsch-Jozsa algorithm and Quantum MDS Codes" (with Dong Pyo Chi, Jinsoo Kim, and Jeyhoon Lee), presented at KIAS Workshop on Quantum Computation and Quantum Information (Korea Institute for Advanced Study, Seoul, Korea), November 2001.

(Speaker: Choi, Sora)
• "Secure quantum cryptographic network based on quantum key distribution" (with Sora Choi and Dong Pyo Chi), presented at KIAS-KAIST 2004 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2004.
• "Quantum key distribution based on conference key agreement" (with Sora Choi and Dong Pyo Chi), presented at 24th Daewoo Mathematics Workshop on Cryptography (Seoul National University, Seoul, Korea), July 2004.

(Speaker: Han, Haesol)
• "Magic Pentagram Problem and Its Quantum Advantage" (with Haesol Han, Jeonghyeon Shin, Minjin Choi, and Byung Chan Kim), presented at KSIAM 2021 Annual Meeting (Bexco, Busan, Korea), December 2021.

(Speaker: Jeong, Kabgyun)
• "Monogamy equality in 2 x 2 x d quantum systems" (with Dong Pyo Chi, Jeong Woon Choi, Kabgyun Jeong, Jeong San Kim, and Taewan Kim), presented at AQIS'08: 8th Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2008.

(Speaker: Kim, Jaewan)
• "Teleportation capability, distillability, and nonlocality on three-qubit states" (with Jaewoo Joo and Jaewan Kim), presented at APWQIS-4: Fourth Asia Pacific Workshop & Third Asia Pacific Conference on Quantum Information Science (Institute of Advanced Study, National University of Singapore, Singapore), July 2007.

(Speaker: Kim, Jeong San)
• "Quantum computational algorithms for hidden symmetry subgroup problems" (with Jeong San Kim and Eunok Bae), presented at Seoul ICM 2014: The International Congress of Mathematicians 2014 (COEX, Seoul, Korea), August 2014.
• "Quantum computational algorithms for hidden symmetry subgroup problems" (with Jeong San Kim and Eunok Bae), presented at MathCrypt 2013: 2013 NIMS Hot Topics Workshops on MathCrypt (BEXCO, Busan, Korea), July 2013.
• "Three party d-level quantum secret sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at KMS 2007 Autumn Conference: the biannual (autumn) Conference of the Korean Mathematical Society (Korea Advanced Institute of Science and Technology, Daejeon, Korea), October 2007.
• "Bound entangled states with nonzero distillable key rate" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at AQIS 2007: Asian Conference on Quantum Information Science (Kyoto University, Kyoto, Japan), September 2007.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at Conference on Information Security and Cryptology 2005 (Seoul National University, Seoul, Korea), December 2005.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at KMS-KIISC 2005 Joint Workshop (Chung-Ang University, Seoul, Korea), October 2005.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at KIAS-KAIST 2005 Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2005.

(Speaker: Kim, Taewan)
• "On quantum signature schemes" (with Jeong Woon Choi and Taewan Kim), presented at KSIAM 2012 Spring Conference: the biannual (spring) Conference of the Korean Society for Industrial and Applied Mathematics (Ewha Womans University, Seoul, Korea), May 2012.
• "Security analysis on arbitrated quantum signature schemes for known quantum messages" (with Taewan Kim and Jeong Woon Choi), presented at KMS 2012 Spring Conference: the biannual (spring) Conference of the Korean Mathematical Society (Sookmyung Women's University, Seoul, Korea), April 2012.
• "Efficient three-to-one entanglement purification protocol" (with Dong Pyo Chi and Taewan Kim), presented at KMS 2011 Fall Conference: the biannual (fall) Conference of the Korean Mathematical Society (Kyungpook National University, Daegu, Korea), October 2011.

(Speaker: Lee, Juhui)
• "Entanglement swapping secures quantum multiparty communications" (with Juhui Lee, Jaewan Kim, and Sung Dahm Oh), presented at the biannual (spring) meeting of the Korean Physical Society (Sungkyunkwan University, Suwon, Korea), May 2004.

(Speaker: Lee, Kyungjin)
• "Multipartite bound entangled states violating multi-setting Bell inequalities" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), presented at KIAS Workshop on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2009.

(Speaker: Lee, Yonghae)
• "Quantum state rotation" (with Yonghae Lee and Hayata Yamasaki), presented at International Conference on Quantum Computing 2020 (Korea Institute for Advanced Study, Seoul, Korea), August 2020.

(Speaker: Park, Jeonghoon)
• "Superactivation of zero-error classical capacity of quantum channels on low dimensional quantum systems" (with Jeonghoon Park), presented at KMS 2011 Fall Conference: the biannual (fall) Conference of the Korean Mathematical Society (Kyungpook National University, Daegu, Korea), October 2011.

(Speaker: Sanders, Barry C.)
• "Monogamy and Polygamy of Entanglement" (with Anirban Das, Gilad Gour, Jeong San Kim, David Meyer, and Barry C. Sanders), presented at ICMIS 2009: International Conference on Mathematics and Information Security (Sohag University, Sohag, Egypt), November 2009.

(Poster Presentations)
• "Relation between quantum coherence and quantum entanglement in quantum measurements " (with Ho-Joon Kim), presented at QIP 2022: the 25th Annual Conference on Quantum Information Processing (Pasadena, CA, USA), March 2022.
• "Quantum key repeater based quantum networks for secret sharing" (with Minjin Choi), presented at QCRYPT 2019: 9th International Conference on Quantum Cryptography (UQAM, Montreal, Canada), August 2019
• "Continuous hidden shift problem on Rⁿ" (with Eunok Bae), presented at AQIS 2019: 19th Asian Quantum Information Science Conference (Korea Institute for Advanced Study, Seoul, Korea), August 2019; 2nd Prize of the Best Student Poster Award
• "One-shot quantum state exchange" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki, and Gerardo Adesso), presented at AQIS 2019: 19th Asian Quantum Information Science Conference (Korea Institute for Advanced Study, Seoul, Korea), August 2019.
• "Continuous hidden shift problem on Rⁿ" (with Eunok Bae), presented at QIP 2019: 22nd Annual Conference on Quantum Information Processing (University of Colorado Boulder, USA), January 2019.
• "Entanglement cost for state exchange" (with Yonghae Lee, Ryuji Takagi, Hayata Yamasaki, and Gerardo Adesso), presented at QIP 2019: 22nd Annual Conference on Quantum Information Processing (University of Colorado Boulder, USA), January 2019.
• "An efficient quantum algorithm for solving continuous hidden translation problem" (with Eunok Bae), presented at AQIS 2018: 18th Asian Quantum Information Science Conference (Nagoya University, Nagoya, Japan), September 2018.
• "Security problems in quantum secret sharing" (with Minjin Shoi and Yonghae Lee), presented at AQIS 2018: 18th Asian Quantum Information Science Conference (Nagoya University, Nagoya, Japan), September 2018.
• "State exchange with quantum side information" (with Yonghae Lee, Ryuji Takagi and Gerardo Adesso), presented at AQIS 2018: 18th Asian Quantum Information Science Conference (Nagoya University, Nagoya, Japan), September 2018.
• "Correspondence between maximally entangled states in discrete and Gaussian regimes" (with Youngrong Lim, Jaewan Kim and Kabgyun Jeong), presented at AQIS 2018: 18th Asian Quantum Information Science Conference (Nagoya University, Nagoya, Japan), September 2018.
• "Activation of quantum capacity of Gaussian channels" (with Youngrong Lim), presented at TQC 2018: The 13th Conference on the Theory of Quantum Computation, Communication and Cryptography (University of Technology Sydney, Sydney, Austrailia), July 2018.
• "State exchange with quantum side information" (with Yonghae Lee), presented at TQC 2018: The 13th Conference on the Theory of Quantum Computation, Communication and Cryptography (University of Technology Sydney, Sydney, Austrailia), July 2018.
• "Conditional quantum entropy power inequality for d-level quantum systems" (with Kabgyun Jeong and Hyunseok Jeong), presented at TQC 2018: The 13th Conference on the Theory of Quantum Computation, Communication and Cryptography (University of Technology Sydney, Sydney, Austrailia), July 2018.
• "State exchange with quantum side information" (with Yonghae Lee, Ryuji Takagi and Gerardo Adesso), presented at 2018 Beyond IID in Information Theory (University of Cambridge, Cambridge, UK), July 2018.
• "Quantum secret sharing and Mermin operator" (with Minjin Choi and Yonghae Lee), presented at QCrypt 2017: 7th International Conference on Quantum Cryptography (University of Cambridge, Cambridge, UK), September 2017.
• "Quantum secret sharing and Mermin operator" (with Minjin Choi and Yonghae Lee), presented at 2017 Quantum Key Distribution Summer School (Institute for Quantum Computing, University of Waterloo, Waterloo, Canada), August 2017.
• "Side information in quantum communication protocols" (with Yonghae Lee), presented at Workshop on Beyond I.I.D. in Information Theory (Institute for Mathematical Sciences, National University of Singapore, Singapore), July 2017.
• "Stability theorem of the output quantum Renyi entropies of the depolarizing channel" (with Eunok Bae, Gilad Gour, Jeonghoon Park and Barry C. Sanders), presented at AQIS 2015: Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2015.
• "Forgeable quantum messages in arbitrated quantum signature schemes" (with Taewan Kim), presented at AQIS 2015: Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2015.
• "Quantum Lovasz number is bounded above by quantum non-signalling assisted zero-error classical capacity for qubit channels" (with Jeonghoon Park), presented at AQIS 2015: Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2015.
• "Forgeable quantum messages in arbitrated quantum signature schemes" (with Taewan Kim, Jeong Woon Choi, and Nam-Su Jho), presented at QIP 2015: 18th Conference on Quantum Information Processing (UTS, Sydney, Australia), January 2015.
• "Quantum messages with signatures forgeable in arbitrated quantum signature schemes" (with Taewan Kim, Jeong Woon Choi, and Nam-Su Jho), presented at QCrypt 2014: 4th international conference on quantum cryptography (Paris, France), September 2014.
• "Stability theorem of the depolarizing channel for the minimal output quantum Renyi entropies and its applications" (with Eunok Bae, Gilad Gour, and Jeonghoon Park), presented at Seoul ICM 2014: The International Congress of Mathematicians 2014 (COEX, Seoul, Korea), August 2014.
• "Quantum computational algorithm for hidden symmetry subgroup problems on semi-direct product of cyclic groups" (with Jeong San Kim and Eunok Bae), presented at QIP 2014: 17th Conference on Quantum Information Processing (Barcelona, Spain), February 2014.
• "A Stability Theorem for the Depolarizing Channel with respect to Minimal Output Entropy" (with Eunok Bae and Jeonghoon Park), presented at CQISC 2013: 10th Canadian Quantum Information Students' Conference (Universiy of Calgary, Calgary, Canada), June 2013.
• "Zero-error classical capacity of qubit channels cannot be superactivated" (with Jeonghoon Park), presented at QIP 2012: 15th Workshop on Quantum Information Processing (Université du Quebec à Montreal, Montreal, Canada), December 2011.
• "Monogamous property of quantum teleportation capability" (with Jeong San Kim and Jaewoo Joo), presented at AQIS'11: 11th Asian Conference on Quantum Information Science (Pukyong National University, Busan, Korea), August 2011.
• "Separable states to distribute entanglement" (with Jeonghoon Park), presented at QIP 2011: 14th Workshop on Quantum Information Processing (Centre for Quantum Technologies, National University of Singapore, Singapore), January 2011.
• "Entanglement purification protocol via two bilateral controlled-NOT operations" (with Dong Pyo Chi and Taewan Kim), presented at QIP 2011: 14th Workshop on Quantum Information Processing (Centre for Quantum Technologies, National University of Singapore, Singapore), January 2011.
• "Entanglement purification protocol via two bilateral controlled-NOT operations" (with Dong Pyo Chi and Taewan Kim), presented at AQIS'10: 10th Asian Conference on Quantum Information Science (The University of Tokyo, Tokyo, Japan), August 2010.
• "Quantum user authentication for multiparty quantum communications" (with Dong Pyo Chi, Jeong Woon Choi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), presented at AQIS'10: 10th Asian Conference on Quantum Information Science (The University of Tokyo, Tokyo, Japan), August 2010.
• "Lower Bound on distributed entanglement in terms of negativity" (with Jeong San Kim), presented at AQIS'10: 10th Asian Conference on Quantum Information Science (The University of Tokyo, Tokyo, Japan), August 2010.
• "Entanglement distribution and dynamics by convex-roof extended negativity" (with Jeong San Kim and Barry C. Sanders), presented at AQIS'10: 10th Asian Conference on Quantum Information Science (The University of Tokyo, Tokyo, Japan), August 2010.
• "Distribution and dynamics of entanglement" (with Jeong San Kim and Barry C. Sanders), presented at TQC 2010: The fifth Conference on the Theory of Quantum Computation, Communication and Cryptography (University of Leeds, Leeds, UK), April 2010.
• "Minimal concurrence of assistance and Mermin inequality on three-qubit pure states" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), presented at QIP 2010: 13th Workshop on Quantum Information Processing (ETH, Zurich, Switzerland), January 2010.
• "N-qubit bound entangled states violating M-setting Bell inequalities" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), presented at QIP 2010: 13th Workshop on Quantum Information Processing (ETH, Zurich, Switzerland), January 2010.
• "Multipartite bound entangled states violating multi-setting Bell inequalities" (with Dong Pyo Chi, Kabgyun Jeong, Taewan Kim, and Kyungjin Lee), presented at AQIS'09: 9th Asian Conference on Quantum Information Science (Nanjing University of Posts & Telecommunications, Nanjing, China), August 2009.
• "Is quantum bit commitment really impossible?", (with Jeong Woon Choi, Dowon Hong, Ku-Young Chang, and Dong Pyo Chi), presented at AQIS'09: 9th Asian Conference on Quantum Information Science (Nanjing University of Posts & Telecommunications, Nanjing, China), August 2009.
• "Any multipartite entangled state violating Bell's inequality is distillable for almost all bipartite splits" (with Jinhyoung Lee and Jaewan Kim), presented at QIP 2009: The Twelfth Workshop on Quantum Information Processing (Santa Fe, New Mexico, USA), January 2009.
• "Quantum states for perfectly secure secret sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at QIP 2009: The Twelfth Workshop on Quantum Information Processing (Santa Fe, New Mexico, USA), January 2009.
• "Monogamy equality in 2 x 2 x d quantum systems" (with Dong Pyo Chi, Jeong Woon Choi, Kabgyun Jeong, Jeong San Kim, and Taewan Kim), presented at QIP 2009: The Twelfth Workshop on Quantum Information Processing (Santa Fe, New Mexico, USA), January 2009.
• "Quantum states for perfectly secure secret sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at AQIS'08: 8th Asian Conference on Quantum Information Science (Korea Institute for Advanced Study, Seoul, Korea), August 2008.
• "Monogamy equality in 2 x 2 x d quantum systems" (with Dong Pyo Chi, Jeong Woon Choi, Kabgyun Jeong, Jeong San Kim, and Taewan Kim), presented at QCMC 2008: The Ninth International Conference on Quantum Communication, Measurement and Computing (Institute for Quantum Information Science, University of Calgary, Calgary, Canada), August 2008.
• "Quantum States for Perfectly Secure Secret Sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at QCMC 2008: The Ninth International Conference on Quantum Communication, Measurement and Computing (Institute for Quantum Information Science, University of Calgary, Calgary, Canada), August 2008.
• "Quantum States for Perfectly Secure Secret Sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at Kyoto University-Seoul National University-Chinese University of Hong Kong Workshop for Young Mathematicians (Research Institute for Mathematical Sciences, Kyoto University, Kyoto, Japan), February 2008.
• "Three party d-level quantum secret sharing protocol" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at QIP 2008: The Eleventh Workshop on Quantum Information Processing (New Delhi, India), December 2007.
• "Three party d-level quantum secret sharing" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at AQIS 2007: Asian Conference on Quantum Information Science (Kyoto University, Kyoto, Japan), September 2007.
• "Bound entangled states with nonzero distillable key rate" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at 2007 HU-SNU Joint Symposium: The 9th Hokkaido-Seoul National University Joint Symposium -- conference for young Japanese and Korean researchers, February 2007.
• "Bound entangled states with nonzero distillable key rate" (with Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, and Taewan Kim), presented at QIP 2007: The Tenth Workshop on Quantum Information Processing (Brisbane, Queensland, Australia), January 2007.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at QIP 2006: The Ninth Workshop on Quantum Information Processing (Paris, France), January 2006.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at NATO Advanced Study Institute: Physics and Computer Science (Cargese, Corsica, France), October 2005.
• "Quantum algorithms without initializing the auxiliary qubits" (with Dong Pyo Chi and Jeong San Kim), presented at EQIS 2005: ERATO Conference on Quantum Information Science (Tokyo, Japan), August 2005.
• "Entanglement of three-qubit pure states in terms of teleportation capability" (with Jaewoo Joo and Jaewan Kim), presented at QIP 2005: The Eighth Workshop on Quantum Information Processing (MIT, Cambridge, USA), January 2005.
• "Secure quantum key distribution network between several parties" (with Sora Choi and Dong Pyo Chi), presented at QIP 2004: The Seventh Workshop on Quantum Information Processing (IQC, Waterloo, Canada), January 2004.
• "Initialization-free function-dependent phase transform in quantum computing" (with Dong Pyo Chi and Jinsoo Kim), presented at QIP 2001: Fourth Workshop on Quantum Information Processing (CWI, Amsterdam, Netherlands), January 2001.

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