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Logic Bell state concentration with parity check measurement |
Jiu Liu1, Lan Zhou2, Wei Zhong1, Yu-Bo Sheng1,3( ) |
1. Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2. School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
3. Key Lab of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education), Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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Abstract Logic qubit plays an important role in current quantum communication. In this paper, we propose an efficient entanglement concentration protocol (ECP) for a new kind of logic Bell state, where the logic qubit is the concatenated Greenber–Horne–Zeilinger (C-GHZ) state. Our ECP relies on the nondemolition polarization parity check (PPC) gates constructed with cross-Kerr nonlinearity, and can distill one pair of maximally entangled logic Bell state from two same pairs of less-entangled logic Bell states. Benefit from the nondemolition PPC gates, the concentrated maximally entangled logic Bell state can be remained for further application. Moreover, our ECP can be repeated to further concentrate the less-entangled logic Bell state. By repeating the ECP, the total success probability can be effectively increased. Based on above features, this ECP may be useful in future long-distance quantum communication.
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| Keywords
concatenated Greenber–Horne–Zeilinger (C-GHZ) state
single photon
cross-Kerr nonlinearity
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Corresponding Author(s):
Yu-Bo Sheng
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Issue Date: 24 October 2018
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