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Chin. Phys. B, 2014, Vol. 23(4): 040304    DOI: 10.1088/1674-1056/23/4/040304
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Implementation of a nonlocal N-qubit conditional phase gate using the nitrogen-vacancy center and microtoroidal resonator coupled systems

Cao Conga, Liu Gangc, Zhang Rua b, Wang Chuana b
a School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China;
b State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China;
c School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abstract  Implementation of a nonlocal multi-qubit conditional phase gate is an essential requirement in some quantum information processing (QIP) tasks. Recently, a novel solid-state cavity quantum electrodynamics (QED) system, in which the nitrogen-vacancy (NV) center in diamond is coupled to a microtoroidal resonator (MTR), has been proposed as a potential system for hybrid quantum information and computing. By virtue of such systems, we present a scheme to realize a nonlocal N-qubit conditional phase gate directly. Our scheme employs a cavity input-output process and single-photon interference, without the use of any auxiliary entanglement pair or classical communication. Considering the currently available technologies, our scheme might be quite useful among different nodes in quantum networks for large-scaled QIP.
Keywords:  N-qubit conditional phase gate      nitrogen-vacancy center      microtoroidal resonator  
Received:  22 July 2013      Revised:  17 September 2013      Accepted manuscript online: 
PACS:  03.67.Lx (Quantum computation architectures and implementations)  
  42.50.Dv (Quantum state engineering and measurements)  
Fund: Project supported by the National Fundamental Research Program of China (Grant No. 2010CB923202), the Fundamental Research Funds for the Central Universities, China, and the National Natural Science Foundation of China (Grant Nos. 61177085, 61205117, and 61377097).
Corresponding Authors:  Wang Chuan     E-mail:  wangchuan82@gmail.com
About author:  03.67.Lx; 42.50.Dv

Cite this article: 

Cao Cong, Liu Gang, Zhang Ru, Wang Chuan Implementation of a nonlocal N-qubit conditional phase gate using the nitrogen-vacancy center and microtoroidal resonator coupled systems 2014 Chin. Phys. B 23 040304

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