Implementation of unambiguous comparison for unknown pure quantum states with cavity-assisted interaction

doi:10.1088/1674-1056/22/5/050306

Abstract We propose two effective schemes for local and remote unknown atomic state comparisons with cavity-assisted single photon input-output process without any initial entanglement or auxiliary resource. And the unambiguous state discrimination is considered using the state comparison process as the basic module. All the implementation schemes here just involve common quantum logic gates and the single qubit measurement. The analysis shows that our schemes are feasible under the current experimental conditions.

Keywords: unambiguous state comparison atomic qubit cavity-assisted interaction

Received: 07 September 2012
Revised: 13 November 2012
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	42.50.Dv	(Quantum state engineering and measurements)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61068001 and 11264042), the China Postdoctoral Science Foundation (Grant No. 2012M520612), and the Talent Program of Yanbian University of China (Grant No. 950010001).

Corresponding Authors: Zhang Shou
E-mail: szhang@ybu.edu.cn

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Cheng Liu-Yong (程留永), Wang Hong-Fu (王洪福), Zhang Shou (张寿), Yeon Kyu-Hwang Implementation of unambiguous comparison for unknown pure quantum states with cavity-assisted interaction 2013 Chin. Phys. B 22 050306

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