Articles
***
47. Kyu-Won Park, Soojoon Lee, and KJ,
Information-theoretic analysis of complex eigenmodes across avoided crossings in open microcavities,
Accepted at Phys. Lett. A (2025.12); arXiv:2509.19827 (2025).
DOI: 10.1016/j.physleta.2025.131298
***
46. Donghwa Ji, Junseo Lee, Myeongjin Shin, Ilkwon Sohn, and KJ,
Bounding quantum uncommon information with quantum neural estimators,
Quantum Sci. Technol. 11, 015001 (2026).
***
45. Kyu-Won Park, KyeongRo Kim, Jinuk Kim, Muhan Choi, and KJ,
Topological Switching via Exceptional Point Pairs in an Optical Microcavity Laser,
Accepted at Photon. Research (2025.10); arXiv:2501.00406v2 (2025).
DOI: 10.1364/PRJ.569511
***
44. IlKwon Sohn, Boseon Kim, Kwangil Bae, Wooyeong Song, Chankyun Lee, KJ, and Wonhyuk Lee,
Fault-tolerant and secure long-distance quantum communication via uncorrectable-error-injection,
EPJ Quantum Technol. 12, 131 (2025).
DOI: 10.1038/s41598-025-18476-y
***
43. Mingyu Lee, Myeongjin Shin, Junseo Lee, and KJ,
Mutual information maximizing quantum generative adversarial networks,
Sci. Rep. 15, 32835 (2025).
DOI: 10.1038/s41598-025-18476-y
***
42. Myeongjin Shin, Junseo Lee, Seungwoo Lee, and KJ,
Resource-efficient algorithm for estimating the trace of quantum state powers,
Quantum 9, 1832 (2025).
DOI: 10.22331/q-2025-08-27-1832
***
41. Kyu-Won Park, Soojoon Lee, and KJ,
Hidden quantum-classical correspondence in chaotic billiards revealed by mutual information,
Phy. Rev. E 112, 024209 (2025).
DOI: 10.1103/qpxx-csdj
***
40. Hyeonjun Yeo, Ha Eum Kim, IlKwon Sohn, and KJ,
Reducing circuit depth in quantum state preparation for quantum simulation using measurements and feedforward,
Phys. Rev. Applied 23, 054066 (2025).
DOI: 10.1103/PhysRevApplied.23.054066
***
39. Jaewon Lee, Changsuk Noh, KJ, and Hyunchul Nha,
Quantum entanglement and extractable work for Gaussian states,
Sci. Rep. 15, 24280 (2025).
DOI: 10.1038/s41598-025-97586-z
***
38. Hyeonjun Yeo, Ha Eum Kim, and KJ,
Approximating Maximum Independent Set on Rydberg Atom Arrays Using Local Detunings,
Adv. Quantum Technol. 8, 2400291 (2025).
***
37. Myeongjin Shin, Seungwoo Lee, Junseo Lee, Mingyu Lee, Donghwa Ji, Hyeonjun Yeo, and KJ,
Disentangling quantum neural networks for unified estimation of quantum entropies and distance measures,
Phys. Rev. A 110, 062418 (2024).
DOI: 10.1103/PhysRevA.110.062418
***
36. Ha Eum Kim and KJ,
Asymptotic teleportation scheme bridging between standard and port-based teleportation,
Quantum Sci. Technol. 9, 045014 (2024).
***
35. Ha Eum Kim and KJ,
Port-based entanglement teleportation via noisy resource states,
Phys. Scr. 99, 035105 (2024).
***
34. Myeongjin Shin, Junseo Lee, and KJ,
Estimating Quantum Mutual Information Through a Quantum Neural Network,
Quantum Inf. Process. 23, 57 (2024).
DOI: 10.1007/s11128-023-04253-1
***
33. Junseo Lee, Hyeonjun Yeo, and KJ,
Weighted p-Renyi Entropy Power Inequality: Information Theory to Quantum Shannon Theory,
Int. J. Theor. Phys. 62, 253 (2023).
DOI: 10.1007/s10773-023-05512-8
***
32. Junseo Lee and KJ,
Quantum Renyi entropy functionals for bosonic Gaussian systems,
Phys. Lett. A 490, 129183 (2023). [Special Issue]
DOI: 10.1016/j.physleta.2023.129183
***
31. KJ,
Sample-size-reduction of quantum states for the noisy linear problem,
Ann. Phys. 449, 169215 (2023).
DOI: 10.1016/j.aop.2022.169215
***
30. Kyu-Won Park, Kwon-Wook Son, Chang-Hyun Ju, and KJ,
Decomposed Entropy and Estimation of Output Power in Deformed Microcavity Lasers,
Entropy 24, 1737 (2022).
DOI: 10.3390/e24121737
***
29. Wooyeong Song, Youngrong Lim, KJ, Jinhyoung Lee, Jung Jun Park, Myungshik Kim, and Jeongho Bang,
Polynomial T-depth Quantum Solvability of Noisy Binary Linear Problem: From Quantum-Sample Preparation to Main Computation,
New J. Phys. 24, 103014 (2022).
***
28. Kyu-Won Park, Juman Kim, Jisung Seo, Songky Moon, KJ, and Kyungwon An,
Entropic comparison of Landau-Zener and Demkov interactions in the phase space of a quadrupole billiard,
Chaos 32, 103101 (2022). [Editor's Pick]
DOI: 10.1063/5.0101495
***
27. Kyu-Won Park, Chang-Hyun Ju, and KJ,
Entropic measure of directional emissions in microcavity lasers,
Phys. Rev. A 106, L031504 (2022).
DOI: 10.1103/PhysRevA.106.L031504
***
26. Wooyeong Song, Youngrong Lim, KJ, Yun-Seong Ji, Jinhyoung Lee, Jaewan Kim, Myungshik Kim, and Jeongho Bang,
Quantum solvability of noisy linear problems by divide-and-conquer strategy,
Quantum Sci. Technol. 7, 025009 (2022).
***
25. Kyu-Won Park, Juman Kim, Jisung Seo, Songky Moon, and KJ,
Indicators of wavefunction (de)localisation for avoided crossing in a quadrupole quantum billiard,
J. Phys. Commun. 5, 115009 (2021).
***
24. Junseo Lee and KJ,
High-dimensional private quantum channels and regular polytopes,
Commun. Phys. 31, 189 (2021).
***
23. KJ,
Approximate Private Quantum Channels on Fermionic Gaussian Systems,
J. Quantum Inf. Sci. 11, 1 (2021).
***
22. KJ, Kyu-Won Park, and Jaewan Kim,
Relative Entropy as a Measure of Difference between Hermitian and Non-Hermitian Systems,
Entropy (Special issue) 22, 809 (2020) Cover Article. [Editor's Choice]
DOI: 10.3390/e22080809
***
21. KJ,
Upper bounds on the private capacity for bosonic Gaussian channels,
Phys. Lett. A 384, 126730 (2020).
DOI: 10.1016/j.physleta.2020.126730
***
20. KJ, Jaewan Kim, and Soojoon Lee,
Generalization of port-based teleportation and controlled teleportation capability,
Phys. Rev. A 102, 012414 (2020).
DOI: 10.1103/PhysRevA.102.012414
***
19. Youngrong Lim, Soojoon Lee, Jaewan Kim, and KJ,
Upper bounds on the quantum capacity for a general attenuator and amplifier,
Phys. Rev. A 99, 052326 (2019).
DOI: 10.1103/PhysRevA.99.052326
***
18. KJ, Hun Hee Lee, and Youngrong Lim,
Universal upper bounds for Gaussian information capacity,
Ann. Phys. 407, 46 (2019).
DOI: 10.1016/j.aop.2019.04.009
***
17. KJ, Yong Jin Kim, Jong Beom Yoon, Geon Woo Kim, Gueha Cho, and Suntaek Kim,
Homomorphic Encryptions at a Long Distance Through Quantum Key Distribution Protocols,
New Phys.: Sae Mulli 69, 187 (2019).
DOI: 10.3938/NPSM.69.187
***
16. Youngrong Lim, Jaewan Kim, Soojoon Lee, and KJ,
Maximally entangled states in discrete and Gaussian regimes,
Quantum Inf. Process. 18, 43 (2019).
DOI: 10.1007/s11128-018-2160-y
***
15. Kyu-Won Park, Songky Moon, Hyunseok Jeong, Jaewan Kim, and KJ,
Non-Hermiticity and conservation of orthogonal relation in dielectric microcavity,
J. Phys. Commun. 2, 075007 (2018).
***
14. Kyu-Won Park, Songky Moon, Younghoon Shin, Jinuk Kim, KJ, and Kyungwon An,
Shannon entropy and avoided crossings in closed and open quantum billiards,
Phys. Rev. E 97, 062205 (2018), Kaleidoscope for June 2018.
DOI: 10.1103/PhysRevE.97.062205
***
13. KJ, Soojoon Lee, and Hyunseok Jeong,
Conditional quantum entropy power inequality for d-level quantum systems,
J. Phys. A: Math. Theor. 51, 145303 (2018).
***
12. KJ, Jun Seo Lee, Jin Tae Choi, Seok Min Hong, Myung Gu Jung, Gyeong Beom Kim, Jae Kwon Kim, and Suntaek Kim,
Single Qubit Private Quantum Channels and 3-Dimensional Regular Polyhedra,
New Phys.: Sae Mulli 68, 232 (2018).
DOI: 10.3938/NPSM.68.232
***
11. Changhun Oh, Hoyong Kim, KJ, and Hyunseok Jeong,
Minimal control power of controlled dense coding and genuine tripartite entanglement,
Sci. Rep. 7, 3765 (2017).
DOI: 10.1038/s41598-017-03822-6
***
10. Kyu-Won Park, Jaewan Kim, and KJ,
Behavior of three modes of decay channels and their self-energies of elliptic dielectric microcavity,
Phys. Rev. A 94, 033833 (2016), Kaleidoscope for September 2016.
DOI: 10.1103/PhysRevA.94.033833
***
9. KJ and Youngrong Lim,
Purification of Gaussian maximally mixed states,
Phys. Lett. A 380, 3607 (2016).
DOI: 10.1016/j.physleta.2016.09.001
***
8. KJ, Jaewan Kim, and Soojoon Lee,
Minimal control power of the controlled teleportation,
Phys. Rev. A 93, 032328 (2016).
DOI: 10.1103/PhysRevA.93.032328
***
7. Kyu-Won Park, Jaewan Kim, and KJ,
Non-Hermitian Hamiltonian and Lamb shift in circular dielectric microcavity,
Opt. Commun. 368, 190 (2016).
DOI: 10.1016/j.optcom.2016.02.001
***
6. KJ, Jaewan Kim, and Su-Yong Lee,
Gaussian private quantum channel with squeezed coherent states,
Sci. Rep. 5, 13974 (2015).
DOI: 10.1038/srep13974
***
5. KJ and Jaewan Kim,
Secure sequential transmission of quantum information,
Quantum Inf. Process. 14, 3523 (2015).
DOI: 10.1007/s11128-015-1054-5
***
4. Dong Pyo Chi and KJ,
Approximate Quantum State Sharings via Pair of Private Quantum Channels,
J. Quant. Inf. Sci. 4, 64 (2014).
***
3. Dong Pyo Chi, KJ, Taewan Kim, Kyungjin Lee, and Soojoon Lee,
Concurrence of assistance and Mermin inequality on three-qubit pure states,
Phys. Rev. A 81, 044302 (2010).
DOI: 10.1103/PhysRevA.81.044302
***
2. Dong Pyo Chi, KJ, Taewan Kim, Kyungjin Lee, and Soojoon Lee,
Multipartite bound entanglement and multisetting Bell inequalities,
Phys. Rev. A 80, 032330 (2009).
DOI: 10.1103/PhysRevA.80.032330
***
1. Dong Pyo Chi, Jeong Woon Choi, KJ, Jeong San Kim, Taewan Kim, and Soojoon Lee,
Monogamy equality in 2⊗2⊗d quantum systems,
J. Math. Phys. 49, 112102 (2008).
DOI: 10.1063/1.3020685
Preprints
***
9. Kyu-Won Park, Soojoon Lee, and KJ,
Correlated Entropic Uncertainty as a Signature of Exceptional Points,
arXiv:2512.18856 (2025).
***
8. Kyu-Won Park, KyeongRo Kim, and KJ,
Singularity Selector: Topological Chirality via Non-Abelian Loops around Exceptional Points,
arXiv:2512.18789 (2025).
***
7. Kyu-Won Park, Soojoon Lee, and KJ,
Chaos-controlled switching between entanglement and coherence,
arXiv:2512.18777 (2025).
***
6. Jaehun Jeong, Donghwa Ji, Junghee Ryu, and KJ,
A Mutual Information-based Metric for Temporal Expressivity and Trainability Estimation in Quantum Policy Gradient Pipelines,
arXiv:2512.05157 (2025).
***
5. Kyu-Won Park, Soojoon Lee, and KJ,
Local Wigner-Mass Maps and Integrated Negativity as Measures of nonclassicality in Quantum Chaotic Billiards,
arXiv:2511.02300 (2025).
***
4. Myeongjin Shin and KJ,
Near optimal quantum algorithm for estimating Shannon entropy,
arXiv:2509.07452 (2025).
***
3. Kartik Anand, KJ, and Junseo Lee,
Collapses in quantum-classical probabilistically checkable proofs and the quantum polynomial hierarchy,
arXiv:2506.19792 (2025).
***
2. Soyoung Shin, Hyeonjun Yeo, Ha Eum Kim, KJ, Wonho Jhe, and Jaewan Kim,
Designing Minimalistic Variational Quantum Ansatz Inspired by Algorithmic Cooling,
arXiv:2501.16776 (2025).
***
1. Kyu-Won Park, Jinuk Kim, and KJ,
Double exceptional points generated by the strong imaginary coupling of a non-Hermitian Hamiltonian in an optical microcavity,
arXiv:2208.06860 (2022).
Thesis
***
- Randomizing Channels in Quantum Information Theory,
Ph.D. Thesis, Seoul National University (SNU), 2012.
***
- (MSc) Quantum Solution to the Extended Newcomb's Paradox,
Seoul National University (SNU), 2006; quant-ph/0511097.
Conference proceedings
***
3. KJ, Youngrong Lim, Jaewan Kim, and Soojoon Lee,
New upper bounds on the quantum capacity for general attenuator and amplifier,
AIP Conference Proceedings, 2241, 020017 (2020).
DOI: 10.1063/5.0011402
***
2. KJ,
Randomizing quantum states to Schatten p-norm for all p≥1,
AIP Conference Proceedings, 1633, 171 (2014).
DOI: 10.1063/1.4903127
***
1. Randomizing Method for Quantum States in Schatten Norms,
In Posters Presented at Horizons Workshop (by F. Scardigli), Foundation of Physics, 44, 891 (2014).
DOI: 10.1007/s10701-013-9769-6
Newsletters
9. 양자정보통신에서의 양자채널식별(QCD) 전략 소개,
Weekly ICT Trends, Institute of Information & communications Technology Planning & Evaluation (IITP), 2171호 (2025. 04. 09).
Weekly ICT Trends, Institute of Information & communications Technology Planning & Evaluation (IITP), 2130호 (2024. 04. 17).
Information and Communication, The Korean Institute of Communications and Information Sciences (KICS), 40(8), pp. 19-24 (2023. 06).
***
6. 양자인터넷에서의 보안, 그리고 사이버 수사의 딜레마,
Police Science Technology Review, Police Science Institute (PSI), 통권 4호, Vol. 01, pp. 59-64 (2023. 06).
***
Weekly ICT Trends, Institute of Information & communications Technology Planning & Evaluation (IITP), 2086호 (2023. 04. 05).
***
Newsletter, Quantum Information Research Support Center (Korean) 2월호 (2022).
***
3. 양자정보기술의 핵심, 양자얽힘의 양자정보학적 해석,
Science and Technology, KOFST Special Features (Korean) 632, pp. 36-39 (2022).
***
2. On MMS in Quantum Information Theory,
The KIAS Newsletter (Korean) 52, pp. 13-15 (2015).
***
1. APCWQIS 2013: Asia-Pacific Conference & Workshop on Quantum Information Science 2013,
The KIAS Newsletter 6, pp. 38-39, (2014).
Patents
***
13. Kyu-Won Park and KJ,
Topological Switching method for using exceptional point pairs in an optical microcavity,
Korea Patent (App. No. 10-2025-0150241) in 17, October 2025.
***
12. Hyeonjun Yeo, Haeum Kim, and KJ,
METHOD FOR REDUCING QUANTUM CIRCUIT DEPTH USING MEASUREMENTS AND FEEDFORWARD,
Korea Patent (App. No. 10-2025-0148183) in 14, October 2025.
***
11. Myeongjin Shin, Donghwa Ji, and KJ,
SYSTEM AND METHOD FOR ESTIMATING BOUNDS FOR QUANTUM UNCOMMON INFORMATION BY QUANTUM NEURAL NETWORK,
Korea Patent (App. No. 10-2025-0096041) in 16, July 2025.
***
10. Myeongjin Shin, Seungwoo Lee, Mingyu Lee, Donghwa Ji, Hyeonjun Yeo, and KJ,
QUANTUM CONVOLUTIONAL NEURAL NETWORK SYSTEM AND OPERATION METHOD,
Korea Patent (App. No. 10-2025-0005647) in 14, January 2025.
***
9. Hyeonjun Yeo, Haeum Kim, and KJ,
METHOD FOR APPROXIMATING MAXIMUM INDEPENDENT SET ON RYDBERG ATOM ARRAYS USING LOCAL DETUNINGS,
Korea Patent (App. No. 10-2024-0104765) in 06, August 2024.
***
8. Myeongjin Shin, Junseo Lee, and KJ,
METHOD FOR ESTIMATING QUANTUM MUTUAL INFORMATION THROUGH A QUANTUM NEURAL NETWORK,
Korea Patent (App. No. 10-2024-0091151) in 10, July 2024.
***
7. Haeum Kim and KJ,
METHOD FOR CALCULATING OF BOUNDARIES OF ENTANGLEMENT IN PORT-BASED ENTANGLEMENT TELEPORTATION SYSTEM,
Korea Patent (App. No. 10-2024-0076152) in 12, June 2024.
***
6. Kyu-Won Park and KJ,
Method and simulation device for estimating decomposition entropy and output power in deformed microcavity laser,
Korea Patent (App. No. 10-2023-0019108) in 14, February 2023; (Patent No. 10-2832270) in 04 July 2025.
***
5. Kyu-Won Park and KJ,
Device that simulates microcavity laser system that creates double exception points using super-radiation,
Korea Patent (App. No. 10-2023-0011707) in 30, January 2023; (Patent No. 10-2798261) in 16 April 2025.
***
4. Kyu-Won Park and KJ,
Entropy Measurement Method and System for Directional Emission of Microcavity Lasers,
Korea Patent (App. No. 10-2022-0077201) in 24, June 2022; (Patent No. 10-2780582) in 07 March 2025.
***
3. KJ,
Method for noise linearity of quantum system and quantum system performing the same,
Korea Patent (App. No. 10-2021-0121720) in 13, September 2021; (Patent No. 10-2809745) in 14 May 2025.
***
2. Soojoon Lee and KJ,
System and Method for Port-based Controlled Quantum Teleportation,
Korea Patent (App. No. 10-2020-0156056) in 19, November 2020; (Patent No. 10-2381094) in 31 March 2022)
***
1. Jeong Woon Choi, Ku-Yong Chang, Dong Pyo Chi, Soojoon Lee, KJ, and Taewan Kim,
Quantum authentication method and device for quantum secret sharing protocol,
Korea Patent (No. 10-2012-0071883) in 03, July 2012.