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Zhengfeng Ji

Postdoctoral Researcher, Perimeter Institute for Theoretical Physics.

Ph.D, Tsinghua University, 2007.

Contact

  • Email: jizhengfeng {at} gmail.com, zji {at} perimeterinstitute.ca
  • Phone: (519) 569-7600 x6602
  • Address: 31 Caroline St. N., Waterloo Ontario, Canada, N2L 2Y5

Research Interests

Quantum Computation and Quantum Information, Artificial Intelligence and Complexity Theory.

Education

2005-2007
Ph.D. in Computer Science
Tsinghua University, Beijing, China
Supervisor: Prof. Mingsheng Ying
2002-2005
M.S. in Computer Science
Tsinghua University, Beijing, China
1998-2002
B.Eng. in Computer Science
Tsinghua University, Beijing, China

Publications

  • Jianxin Chen, Zhengfeng Ji, Mary Beth Ruskai, Bei Zeng, and Duanlu Zhou. Principle of maximum entropy and ground spaces of local Hamiltonians. arXiv:1010.2739, 2010. (Slides, in PDF)
  • Samuel A. Ocko, Xie Chen, Bei Zeng, Beni Yoshida, Zhengfeng Ji, Mary Beth Ruskai, and Isaac L. Chuang. Quantum codes give counterexamples to the unique pre-image conjecture of the N-representability problem. arXiv:1010.2717, 2010.
  • Zhengfeng Ji, Zhaohui Wei, and Bei Zeng. Complete characterization of the ground space structure of two-body frustration-free Hamiltonians for qubits. arXiv:1010.2480, 2010. (Slides, in PDF)
  • Markus Grassl, Zhengfeng Ji, Zhaohui Wei, and Bei Zeng. Quantum capacity approaching codes for the detected-jump channel. arXiv:1008.3350, 2010.
  • 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. arXiv:1004.3787, 2010. (Slides, in PDF)
  • Lin Chen, Eric Chitambar, Runyao Duan, Zhengfeng Ji, and Andreas Winter. Tensor rank and stochastic entanglement catalysis for multipartite pure states. Physical Review Letters, 105(20):200501, 2010. See also arXiv:1003.3059.
  • Xie Chen, Runyao Duan, Zhengfeng Ji, and Bei Zeng. Quantum state reduction for universal measurement based computation. Physical Review Letters, 105(2):020502, 2010. See also arXiv:1002.1567.
  • Mingsheng Ying, Runyao Duan, Yuan Feng, and Zhengfeng Ji. Predicate transformer semantics of quantum programs. In Simon Gay and Ian Mackie, editors, Semantic techniques in quantum computation, chapter 8, pages 311–360. Cambridge University Press, 2010.
  • Runyao Duan, Markus Grassl, Zhengfeng Ji, and Bei Zeng. Multi-error-correcting amplitude damping codes. In IEEE International Symposium on Information Theory (ISIT), 2010. See also arXiv:1001.2356.
  • Rahul Jain, Zhengfeng Ji, Sarvagya Upadhyay, and John Watrous. QIP = PSPACE. In STOC '10: Proceedings of the 42nd ACM Symposium on Theory of Computing, pages 573–582, New York, NY, USA, 2010. STOC Best Paper Award. See also arXiv:0907.4737. (Slides, in PDF)
  • Zhengfeng Ji and Xiaodi Wu. Non-Identity Check remains QMA-complete for short circuits. arXiv:0906.5416, 2009. Presented at AQIS '09, Nanjing. (Slides, in PDF)
  • Mingsheng Ying, Yuan Feng, Runyao Duan, and Zhengfeng Ji. An algebra of quantum processes. ACM Transactions On Computational Logic, 10(3):19, 2009. See also arXiv:0707.0330.
  • Zhengfeng Ji, Jianxin Chen, Zhaohui Wei, and Mingsheng Ying. The LU-LC conjecture is false. Quantum Information and Computation, 10(1&2):97–108, 2010. Presented at QIP 2008. See also arXiv:0709.1266. (Slides, in PDF)
  • Zhengfeng Ji, Guoming Wang, Runyao Duan, Yuan Feng, and Mingsheng Ying. Parameter estimation of quantum channels. IEEE Transactions on Information Theory, 54(11):5172–5185, 2008. See also arXiv:quant-ph/0610060. (Slides, in PDF)
  • Zhengfeng Ji, Yuan Feng, Runyao Duan, and Mingsheng Ying. Identification and distance measures of measurement apparatus. Physical Review Letters, 96(20):200401, 2006. See also arXiv:quant-ph/0601090. (Slides, in PDF)
  • Zhengfeng Ji, Yuan Feng, Runyao Duan, and Mingsheng Ying. Boundary effect of deterministic dense coding. Physical Review A, 73(3):034307, 2006. See also arXiv:quant-ph/0601136.
  • Zhengfeng Ji, Yuan Feng, and Mingsheng Ying. Local cloning of two product states. Physical Review A, 72(3):032324, 2005. See also arXiv:quant-ph/0501089.
  • Zhengfeng Ji, Hongen Cao, and Mingsheng Ying. Optimal conclusive discrimination of two states can be achieved locally. Physical Review A, 71(3):032323, 2005. See also arXiv:quant-ph/0407120.
  • Zhengfeng Ji, Runyao Duan, and Mingsheng Ying. Comparability of multipartite entanglement. Physics Letters A, 330:418–423, 2004. See also arXiv:quant-ph/0407001.
  • Jianxin Chen, Runyao Duan, Zhengfeng Ji, Mingsheng Ying, and Jun Yu. Existence of universal entangler. Journal of Mathematical Physics, 49(1):012103, 2008. See also arXiv:0704.1473.
  • Runyao Duan, Yuan Feng, Zhengfeng Ji, and Mingsheng Ying. Distinguishing arbitrary multipartite basis unambiguously using local operations and classical communication. Physical Review Letters, 98(23):230502, 2007. See also arXiv:quant-ph/0612034.
  • Runyao Duan, Zhengfeng Ji, Yuan Feng, and Mingsheng Ying. Some issues in quantum information theory. Journal of Computer Science and Technology, 21(5):776–789, 2006.
  • Zhaohui Wei, Zhengfeng Ji, and Mingsheng Ying. Majorization in quantum adiabatic algorithms. Physical Review A, 74(4):042320, 2006. See also arXiv:quant-ph/0606015.
  • Yuan Feng, Runyao Duan, and Zhengfeng Ji. Optimal dense coding with arbitrary pure entangled states. Physical Review A, 74(1):012310, 2006. See also arXiv:quant-ph/0604149.
  • Yuan Feng, Runyao Duan, Zhengfeng Ji, and Mingsheng Ying. Probabilistic bisimulations for quantum processes. Information and Computation, 205(11):1608–1639, 2007. See also arXiv:cs.LO/0601014.
  • Yuan Feng, Runyao Duan, Zhengfeng Ji, and Mingsheng Ying. Proof rules for the correctness of quantum programs. Theoretical Computer Science, 386(1–2):151–166, 2007. See also arXiv:cs.PL/0507043.
  • Yuan Feng, Runyao Duan, and Zhengfeng Ji. Condition and capability of quantum state separation. Physical Review A, 72(1):012313, 2005. See also arXiv:quant-ph/0506021.
  • Runyao Duan, Yuan Feng, Zhengfeng Ji, and Mingsheng Ying. Efficiency of deterministic entanglement transformation. Physical Review A, 71(2):022305, 2005. See also arXiv:quant-ph/0410046.
  • Runyao Duan, Zhengfeng Ji, Yuan Feng, and Mingsheng Ying. Quantum operation, quantum Fourier transform and semi-definite programming. Physics Letters A, 323(1–2):48–56, 2004. See also arXiv:quant-ph/0304145.

Last update: Nov. 21, 2010

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