中国物理B ›› 2016, Vol. 25 ›› Issue (2): 20306-020306.doi: 10.1088/1674-1056/25/2/020306

• GENERAL • 上一篇    下一篇

Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement

Jino Heo, Chang-Ho Hong, Dong-Hoon Lee, Hyung-Jin Yang   

  1. 1. Graduate School of Information Security (GSIS), Korea University, Anam 5-ga Sungbuk-gu, Seoul, Republic of Korea;
    2. Center for Information Security Technologies (CIST), Korea University, Seoul, Republic of Korea;
    3. Department of Physics, Korea University, Sejong, 339-700, Republic of Korea
  • 收稿日期:2015-07-31 修回日期:2015-10-16 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Hyung-Jin Yang E-mail:yangh@korea.ac.kr

Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement

Jino Heo1,2, Chang-Ho Hong1,2, Dong-Hoon Lee1,2, Hyung-Jin Yang1,3   

  1. 1. Graduate School of Information Security (GSIS), Korea University, Anam 5-ga Sungbuk-gu, Seoul, Republic of Korea;
    2. Center for Information Security Technologies (CIST), Korea University, Seoul, Republic of Korea;
    3. Department of Physics, Korea University, Sejong, 339-700, Republic of Korea
  • Received:2015-07-31 Revised:2015-10-16 Online:2016-02-05 Published:2016-02-05
  • Contact: Hyung-Jin Yang E-mail:yangh@korea.ac.kr

摘要: We propose an arbitrary controlled-unitary (CU) gate and a bidirectional transfer scheme of quantum information (BTQI) for unknown photons. The proposed CU gate utilizes quantum non-demolition photon-number-resolving measurement based on the weak cross-Kerr nonlinearities (XKNLs) and two quantum bus beams; the proposed CU gate consists of consecutive operations of a controlled-path gate and a gathering-path gate. It is almost deterministic and is feasible with current technology when a strong amplitude of the coherent state and weak XKNLs are employed. Compared with the existing optical multi-qubit or controlled gates, which utilize XKNLs and homodyne detectors, the proposed CU gate can increase experimental realization feasibility and enhance robustness against decoherence. According to the CU gate, we present a BTQI scheme in which the two unknown states of photons between two parties (Alice and Bob) are mutually swapped by transferring only a single photon. Consequently, by using the proposed CU gate, it is possible to experimentally implement the BTQI scheme with a certain probability of success.

关键词: cross-Kerr nonlinearity, quantum non-demolition photon-number-resolving measurement, bidirectional transfer of quantum information

Abstract: We propose an arbitrary controlled-unitary (CU) gate and a bidirectional transfer scheme of quantum information (BTQI) for unknown photons. The proposed CU gate utilizes quantum non-demolition photon-number-resolving measurement based on the weak cross-Kerr nonlinearities (XKNLs) and two quantum bus beams; the proposed CU gate consists of consecutive operations of a controlled-path gate and a gathering-path gate. It is almost deterministic and is feasible with current technology when a strong amplitude of the coherent state and weak XKNLs are employed. Compared with the existing optical multi-qubit or controlled gates, which utilize XKNLs and homodyne detectors, the proposed CU gate can increase experimental realization feasibility and enhance robustness against decoherence. According to the CU gate, we present a BTQI scheme in which the two unknown states of photons between two parties (Alice and Bob) are mutually swapped by transferring only a single photon. Consequently, by using the proposed CU gate, it is possible to experimentally implement the BTQI scheme with a certain probability of success.

Key words: cross-Kerr nonlinearity, quantum non-demolition photon-number-resolving measurement, bidirectional transfer of quantum information

中图分类号:  (Quantum information)

  • 03.67.-a
42.50.Ex (Optical implementations of quantum information processing and transfer) 42.65.-k (Nonlinear optics) 03.67.Hk (Quantum communication)