Entanglement purification and concentration of electron-spin entangled states using quantum-dot spins in optical microcavities

被引：204

作者：

Wang, Chuan ^{[1
,2
,3
]}

Zhang, Yong ^{[1
,2
]}

Jin, Guang-sheng ^{[1
,2
]}

机构：

[1] Beijing Univ Posts & Telecommun, Sch Sci, Beijing 100876, Peoples R China

[2] Beijing Univ Posts & Telecommun, Key Lab Opt Commun & Lightwave Technol, Beijing 100876, Peoples R China

[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW A | 2011年 / 84卷 / 03期

关键词：

CRYPTOGRAPHY; COMMUNICATION;

D O I：

10.1103/PhysRevA.84.032307

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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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页数：8

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