Eur. Phys. J. D (2012) 66: 122
https://doi.org/10.1140/epjd/e2012-20604-9

Regular Article

Controllable coupling of distributed qubits within a microtoroidal cavity network

¹ Department of Physics, Fuzhou University, Fuzhou 350002, P.R. China
² School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P.R. China
³ Department of Physics, Harbin Institute of Technology, Harbin 150001, P.R. China

^a e-mail: xia-208@163.com

Received: 17 October 2011
Received in final form: 15 January 2012
Published online: 17 May 2012

Abstract

We propose a scheme to control the coupling between two arbitrary atoms scattered within a quantum network composed of microtoroidal cavities linked by a ring-fibre. The atom-atom effective couplings are induced by pairing of off-resonant Raman transitions. The couplings can be arbitrarily controlled by adjusting classical fields. Compared with the previous scheme [S.B. Zheng, C.P. Yang, F. Nori, Phys. Rev. A 82, 042327 (2010)], the present scheme uses microtoroidal cavities with higher coupling efficiency than Fabry-Perot cavities. Furthermore, the scheme is not only suitable for the short-fibre limit, but also for multiple fibre modes. The added fibre modes can play a positive role, especially when the coupling rate between cavity-mode and fibre-mode is not large. In addition, a wider frequency domain of fibre modes can be used in this scheme.