期刊
PHYSICAL REVIEW A
卷 84, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.84.032307
关键词
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资金
- National Fundamental Research Program [2010CB923202]
- Education Ministry of China [20090005120008]
- Fundamental Research Funds for the Central Universities [BUPT2009RC0710]
- China National Natural Science Foundation [10704010, 10947151]
We present an entanglement purification protocol and an entanglement concentration protocol for electron-spin entangled states, resorting to quantum-dot spin and optical-microcavity-coupled systems. The parity-check gates (PCGs) constructed by the cavity-spin-coupling system provide a different method for the entanglement purification of electron-spin entangled states. This protocol can efficiently purify an electron ensemble in a mixed entangled state. The PCGs can also concentrate electron-spin pairs in less-entangled pure states efficiently. The proposed methods are more flexible as only single-photon detection and single-electron detection are needed.
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