EPL, 82 (2008) 10004
DOI: 10.1209/0295-5075/82/10004

Generation of symmetric Dicke states of many atomic qubits by adiabatic passage

X. L. Zhang¹, Y. X. Zhang¹ and M. Feng<sup>2

1</sup>  Center for Modern Physics and Department of Physics, Chongqing University - Chongqing 400044, 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, China

xlzhang168@gmail.com
mangfeng@wipm.ac.cn

received 7 December 2007; accepted in final form 11 February 2008; published April 2008
published online 14 March 2007

Abstract
We investigate how to deterministically generate symmetric Dicke states of many atomic qubits in a high-Q two-mode optical cavity via dark-state evolution. Our scheme is based on adiabatic evolution, which makes the relevant dynamics insensitive to randomness of the moderate fluctuations of experimental parameters. Assisted by the postselective process, our scheme could be of the fidelity of unity, and robust to imperfect factors such as dissipation, mismatch of cavity parameters, photon loss, and detector inefficiency.

PACS
03.67.Bg - Entanglement production and manipulation.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).
42.50.Dv - Quantum state engineering and measurements.

© EPLA 2008