期刊
PHYSICAL REVIEW A
卷 84, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.84.052312
关键词
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资金
- National Natural Science Foundation of China [10974020, 11174039]
- Foundation for the Author of National Excellent Doctoral Dissertation of the People's Republic of China [200723]
- Beijing Natural Science Foundation [1082008]
- Fundamental Research Funds for the Central Universities
We present an efficient multipartite entanglement purification protocol (MEPP) for N-photon systems in a Greenberger-Horne-Zeilinger state with parity-check detectors. It contains two parts. One is the conventional MEPP with which the parties can obtain a high-fidelity N-photon ensemble directly, similar to the MEPP with controlled-NOT gates. The other is our recycling MEPP in which the entanglement link is used to produce some N-photon entangled systems from entangled N'-photon subsystems (2 <= N' < N) coming from the instances which are just discarded in all existing conventional MEPPs. The entangled N'-photon subsystems are obtained efficiently by measuring the photons with potential bit-flip errors. With these two parts, the present MEPP has a higher efficiency than all other conventional MEPPs.
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