Eur. Phys. J. D (2012) 66: 238
https://doi.org/10.1140/epjd/e2012-30368-9

Regular Article

Quantum gate operations in decoherence-free fashion with separate nitrogen-vacancy centers coupled to a whispering-gallery mode resonator

¹ Department of Physics and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, P.R. China
² State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P.R. China

^a e-mail: qiongchen0515@gmail.com
^b e-mail: mangfeng@wipm.ac.cn

Received: 11 June 2012
Received in final form: 4 July 2012
Published online: 12 September 2012

Abstract

We propose a scheme to achieve quantum gate operations within decoherence-free subspace (DFS) using nitrogen-vacancy centers in separate diamond nanocrystals coupled to a whispering-gallery mode resonator. By virtue of Raman transitions in the dispersive regime, we present two different methods for realizing quantum gating within DFS in a deterministic way. The quantum gating is seriously treated by considering all kinds of decoherence mechanisms, and the experimental feasibility is achieved using currently available technology.