Deterministic generation of arbitrary multi-atom symmetric Dicke states by a combination of quantum Zeno dynamics and adiabatic passage

¹  Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology Harbin, Heilongjiang 150001, PRC
²  Department of Physics, College of Science, Yanbian University - Yanji, Jilin 133002 PRC
³  BK21 Program Physics & Department of Physics, College of Natural Science, Chungbuk National University Cheonju, Chungbuk 361-763, Republic of Korea

Corresponding author: szhang@ybu.edu.cn

Received: 14 February 2010
Accepted: 28 May 2010

Abstract

We have investigated theoretically a deterministic method for preparing arbitrary multi-atom symmetric Dicke states in cavity quantum electrodynamics (QED) via combining quantum Zeno dynamics with adiabatic passage. By quantitatively discussing the case of N = 4, we show that all these states are robust against both the loss of cavity and atomic spontaneous emission, since no cavity-photon or excited level of atom is populated during the whole operation. Meanwhile, the interaction time does not change with the variation of excitation number l of  (l=1, 2, 3). Furthermore, the operating time for creating arbitrary N-atom symmetric Dicke states is just the same as the one for preparing . This particular feature would reduce the complexity for achieving Dicke states in experimental operation.