Efficient entanglement concentration for quantum dot and optical microcavities systems

  • Authors:

  • Yu-Bo Sheng;Lan Zhou;Lei Wang;Sheng-Mei Zhao

  • Affiliations:

  • Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, China 210003 and Key Lab of Broadband Wireless Communication and Sensor Network Technology ...;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, China 210003 and College of Mathematics and Physics, Nanjing University of Posts and Telec ...;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, China 210003 and Key Lab of Broadband Wireless Communication and Sensor Network Technology ...;Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, China 210003 and Key Lab of Broadband Wireless Communication and Sensor Network Technology ...

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2013

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Abstract

A recent paper (Chuan Wang in Phys Rev A 86:012323, 2012) discussed an entanglement concentration protocol (ECP) for partially entangled electrons using a quantum dot and microcavity coupled system. In his paper, each two-electron spin system in a partially entangled state can be concentrated with the assistance of an ancillary quantum dot and a single photon. In this paper, we will present an efficient ECP for such entangled electrons with the help of only one single photon. Compared with the protocol of Wang, the most significant advantage is that during the whole ECP, the single photon only needs to pass through one microcavity which will increase the total success probability if the cavity is imperfect. The whole protocol can be repeated to get a higher success probability. With the feasible technology, this protocol may be useful in current long-distance quantum communications.