Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement |
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Authors: | Jino Heo Chang-Ho Hong Dong-Hoon Lee Hyung-Jin Yang |
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Institution: | 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 |
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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. |
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Keywords: | cross-Kerr nonlinearity quantum non-demolition photon-number-resolving measurement bidirectional transfer of quantum information |
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