Multipartite entanglement purification with quantum nondemolition detectors |
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Authors: | Y B Sheng F G Deng B K Zhao T J Wang and H Y Zhou |
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Institution: | (2) Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Innsbruck, Austria;(3) NEC Laboratories America, Inc., Princeton, USA; |
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Abstract: | We present a scheme for multipartite entanglement purification of
quantum systems in a Greenberger-Horne-Zeilinger state with quantum
nondemolition detectors (QNDs). This scheme does not require the
controlled-not gates which cannot be implemented perfectly with
linear optical elements at present, but QNDs based on cross-Kerr
nonlinearities. It works with two steps, i.e., the bit-flipping
error correction and the phase-flipping error correction. These two
steps can be iterated perfectly with parity checks and simple
single-photon measurements. This scheme does not require the parties
to possess sophisticated single photon detectors. These features
maybe make this scheme more efficient and feasible than others in
practical applications. |
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Keywords: | |
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