Eur. Phys. J. D (2012) 66: 1
https://doi.org/10.1140/epjd/e2011-10641-3

Regular Article

Scheme for n phase gates operation and one-step preparation of highly entangled cluster state

¹ Department of Physics and Information Engineering, Huaihua University, Huaihua, Hunan 418008, P.R. China
² College of Physics Science and Information Engineering, Jishou University, Jishou, Hunan 416000, P.R. China

^a e-mail: hhkhsong@vip.sina.com

Received: 6 November 2010
Received in final form: 9 September 2011
Published online: 6 January 2012

Abstract

In the system with superconducting quantum interference devices (SQUIDs) in a cavity, we propose a scheme for simultaneous implementing n phase gates and one step preparing the highly entangled cluster states based on the two-channel Raman interaction. In our scheme, the system is independent to the photon number of the cavity field, the cavity field can be initially in an arbitrary state, which is convenient for the experimental operation. The n phase gates operation and the cluster state generation are realized by using only the two lower flux states of the SQUID and the excited state would not be excited so that the influence of the decoherence due to spontaneous emission of the SQUID’s levels is possible to minimize. More importantly, the operation time of the phase gates is independent of the number n of the qubits. Finally, the experimental feasibility is also discussed in detail.