Jianxin Chen

Research

My research focuses on the theory of quantum information and its applications to algorithms, complexity theory and cryptography. Specific topics that I am currently interested in include algebraic geometry applications in quantum information theory, the theory of entanglement and quantum channels.

Papers

Jianxin Chen, Zhengfeng Ji, Chi-Kwong Li, Yiu-Tung Poon, Yi Shen, Nengkun Yu, Bei Zeng, Duanlu Zhou. Principle of Maximum Entropy and Quantum Phase Transitions
Submitted.
Also available as arXiv.org e-Print 1406.5046

Jianxin Chen, Lin Chen, Bei Zeng. Unextendible Product Basis for Fermionic Systems.
Journal of Mathematical Physics, 55, 082207, 2014
Also available as arXiv.org e-Print 1312.4218

Jianxin Chen, Zhengfeng Ji, David Kribs, Norbert Lütkenhaus and Bei Zeng Symmetric Extension of Two-Qubit States.
Physical Review A, 90:032318, 2014.
Also available as arXiv.org e-Print 1310.3530

Joel Klassen, Jianxin Chen, and Bei Zeng Universal Entanglers for Bosonic and Fermionic Systems.
Presented at 8th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2013), Guelph, Canada, 2013
Also available as arXiv.org e-Print 1305.7489

Salman Beigi, Jianxin Chen, Markus Grassl, Zhengfeng Ji, Qiang Wang and Bei Zeng Symmetries of Codeword Stabilized Quantum Codes.
Presented at 8th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2013), Guelph, Canada, 2013
Also available as arXiv.org e-Print 1303.7020

Lin Chen, Jianxin Chen, Dragomir Z. Djokovic and Bei Zeng. Universal Subspaces for Local Unitary Groups of Fermionic Systems.
Communications in Mathematical Physics
Also available as arXiv.org e-Print 1301.3421

Jianxin Chen, and Nathaniel Johnston. The Minimum Size of Unextendible Product Bases in the Bipartite Case (and Some Multipartite Cases).
Communications in Mathematical Physics 
Also available as arXiv.org e-Print 1301.1406

Jianxin Chen, Hillary Dawkins, Zhengfeng Ji, Nathaniel Johnston, David Kribs, Frederic Shultz and Bei Zeng. Uniqueness of Quantum States Compatible with Given Measurement Results
Physical Review A, 88:012109, 2013.
Also available as arXiv.org e-Print 1212.3503

Jianxin Chen, Zhengfeng Ji, David W Kribs and Bei Zeng. Minimum Entangling Power is Close to Its Maximum.
Also available as arXiv.org e-Print 1210.1296

Jianxin Chen, and Andreas Winter. Non-Additivity of the Entanglement of Purification (Beyond Reasonable Doubt).
Submitted.
Also available as arXiv.org e-Print 1206.1307
Presented at 12th Asian Quantum Information Science Conference, Suzhou, China, Aug. 2012.

Jianxin Chen, Zhengfeng Ji, David Kribs, Zhaohui Wei and Bei Zeng. Ground-State Spaces of Frustration-Free Hamiltonians.
Journal of Mathematical Physics, 53(10):102201, 2012.
Also available as arXiv.org e-Print 1112.0762

Jianxin Chen, Zhengfeng Ji, Bei Zeng and Duanlu Zhou. From Ground States to Local Hamiltonians.
Physical Review A, 86:022339, 2012
Also available as arXiv.org e-Print 1110.6583

Jianxin Chen, Zhengfeng Ji, Mary Beth Ruskai, Bei Zeng and Duan-Lu Zhou. Comment on some results of Erdahl and the convex structure of reduced density matrices.
Journal of Mathematical Physics, 53(7):072203, 2012.
Also available as arXiv.org e-Print 1205.3682

Jianxin Chen, Zhengfeng Ji, Zhaohui Wei and Bei Zeng. Correlations in excited states of local Hamiltonians. Also available as arXiv.org e-Print 1106.1373

Jianxin Chen, Zhengfeng Ji, Alexander Klyachko, David Kribs, and Bei Zeng. Rank reduction for local consistency problem.
Journal of Mathematical Physics, 53(2):022202, 2012.
Also available as arXiv.org e-Print 1106.3235

Cheng Lu, Jianxin Chen, and Runyao Duan. Some bounds on the minimum number of queries required for quantum channel perfect discrimination.
Quantum Information and Computation, 12(1&2):0138--0148, 2012.
A preliminary version titled Optimal Perfect Distinguishability between Unitaries and Quantum Operations is also available as arXiv.org e-print 1010.2298
Jianxin Chen, Toby Cubitt, Aram Harrow, and Graeme Smith. Entanglement can completely defeat quantum noise
 Physical Review Letter (highlighted), 107:250504, Dec 2011. See accompanying Physics Synopsis
Also available as arXiv.org e-Print 1109.0540

Jianxin Chen, Xie Chen, Runyao Duan, Zhengfeng Ji, and Bei Zeng. No-go theorem for one-way quantum computing on naturally occurring two-level systems.
 Physical Review A (rapid communication), 83:050301R, 2011.
Also available as arXiv.org e-Print 1004.3787
Presented at 14th Workshop on Quantum Information Processing, The Capella, Sentosa Singapore, Jan. 2011.

Toby S. Cubitt, Jianxin Chen, and Aram W. Harrow. Superactivation of the asymptotic zero-error classical capacity of a quantum channel.
Information Theory, IEEE Transactions on, 57(12):8114-8126, 2011.
Also available as arXiv.org e-Print 0906.2547

Toby S. Cubitt, Jianxin Chen, Aram W. Harrow and Graeme Smith. Super-duper-activation of the zero-error quantum capacity
Presented at Information Theory Proceedings (ISIT), 2010 IEEE International Symposium on, Austin, Texas, United States, Jun., 2010.
Also presented at 13th Workshop on Quantum Information Processing, Zurich, Switzerland, Jan. 2010.
Also presented at 10th Asian Quantum Information Science Conference , Tokyo, Japan, Aug. 2010.

Zhengfeng Ji, Jianxin Chen, Zhaohui Wei, and Mingsheng Ying. The LU-LC conjecture is false.
Quantum Information and Computation, 10(1&2), 2010.
Also available as arXiv.org e-Print 0709.1266
Presented at The 11th Workshop on Quantum Information Processing, New Delhi, India, Dec. 2007.

Jianxin Chen and Mingsheng Ying. Ancilla-assisted discrimination of quantum gates.
Quantum Information and Computation, 10(1&2), 2010.
Also available as arXiv.org e-Print 0809.0336

Jianxin Chen, Runyao Duan, Zhengfeng Ji, Mingsheng Ying, and Jun Yu. Existence of universal entangler.
Journal of Mathematical Physics, 49:012103, 2008.
Also available as arXiv.org e-Print 0704.1473

Mingsheng Ying, Jianxin Chen, Yuan Feng, and Runyao Duan. Commutativity of quantum weakest preconditions.
Info. Proc. Lett., 104(4):152-158, 2007.

Lirong Xia, Jianxin Chen, Xiaotong Zhang. A Solution for Student Interview Problem (in Chinese),
Mathematics in Practice and Theory, 37(14):145, 2007.

Teaching

Instructor: MATH*2150DE,  Applied Matrix Algebra (Winter 2014), University of Guelph
Instructor: QIC 890 and 891: Module 4   Selected Advanced Topics in Quantum Information (Spring 2012), University of Waterloo
Teaching Assistant: Discrete Mathematics(Spring 2007), Tsinghua University
Teaching Assistant: Discrete Mathematics(Spring 2006), Tsinghua University

Contact

Postal Address

Joint Center for Quantum Information and Computer Science,
Computer and Space Sciences Building, Bldg 224,
Stadium Drive University of Maryland, College Park, MD 20742

Telephone

Cell: (240) 542-8777

Office

CSS2216

Email

chenkenshin at gmail dot com

Personal Homepage

http://jianxin.iqubit.org