Nondestructive discrimination of Greenberger-Horne-Zeilinger-basis states via two-qubit parity detection  

作　　者：WANG XinWen TANG ShiQing KUANG LeMan 

机构地区：[1]Department of Physics and Electronic Information Science, Hengyang Normal University [2]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics,Hunan Normal University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第10期1848-1853,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2013CB921804);the National Natural Science Foundation of China(Grant Nos.11004050,11075050 and 11375060);the Key Project of Chinese Ministry of Education(Grant No.211119);the China Postdoctoral Science Foundation funded project(Grant No.2013T60769);the construct program of the key discipline in Hunan province

摘　　要：We propose new methods to construct universal Greenberger-Horne-Zeilinger(GHZ)-state analyzers without destroying the qubits by using two-qubit parity gates. The idea can be applied to any physical systems where the two-qubit parity gate can be realized.We also investigate the feasibility of nondestructively distinguishing the GHZ-basis states for photonic qubits with such an idea.The nondestructive GHZ-state analyzers can act as generators of GHZ entangled states and are expected to find useful applications for resource-saving quantum information processing.We propose new methods to construct universal Greenberger-Horne-Zeilinger （GHZ）-state analyzers without destroying the qubits by using two-qubit parity gates. The idea can be applied to any physical systems where the two-qubit parity gate can be realized. We also investigate the feasibility of nondestructively distinguishing the GHZ-basis states for photonic qubits with such an idea. The nondestructive GHZ-state analyzers can act as generators of GHZ entangled states and are expected to find useful applications for resource-saving quantum information processing.

关 键 词：nondestructive GHZ-state analyzer two-qubit parity gate photon 

分 类 号：O413.1[理学—理论物理]