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Entropy 2013, 15(5), 1776-1820; doi:10.3390/e15051776

Review

Quantum Entanglement Concentration Based on Nonlinear Optics for Quantum Communications

Yu-Bo Sheng ^1,2,*  and Lan Zhou ^2,3

¹ Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China ² Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing 210003, China ³ College of Mathematics & Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003, China

* Author to whom correspondence should be addressed.

Received: 14 March 2013; in revised form: 3 May 2013 / Accepted: 8 May 2013 / Published: 16 May 2013

(This article belongs to the Special Issue Quantum Information 2012)

Download PDF Full-Text [623 KB, Updated Version, uploaded 21 May 2013 18:48 CEST]

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Abstract: Entanglement concentration is of most importance in long distance quantum communication and quantum computation. It is to distill maximally entangled states from pure partially entangled states based on the local operation and classical communication. In this review, we will mainly describe two kinds of entanglement concentration protocols. One is to concentrate the partially entangled Bell-state, and the other is to concentrate the partially entangled W state. Some protocols are feasible in current experimental conditions and suitable for the optical, electric and quantum-dot and optical microcavity systems.

Keywords: quantum entanglement; entanglement concentration; quantum communication

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