Efficient multipartite entanglement purification with the entanglement link from a subspace

被引：116
作者：
Deng, Fu-Guo [1 ]
机构：
[1] Beijing Convent Univ, Dept Phys, Appl Opt Beijing Area Major Lab, Beijing 100875, Peoples R China
来源：
PHYSICAL REVIEW A | 2011年 / 84卷 / 05期
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
QUANTUM CRYPTOGRAPHY; STATE;
D O I：
10.1103/PhysRevA.84.052312
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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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页数：15
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