Entanglement evolution of a two-qubit system with decay beyond the rotating-wave approximation
Yang Qing(杨青)a), Yang Ming(杨名)a), Li Da-Chuang(李大创)a), and Cao Zhuo-Liang(曹卓良)b)†
a Key Laboratory of Opto-electronic Information Acquisition and Manipulation (Ministry of Education), School of Physics & Material Science, Anhui University, Hefei 230039, China; b Department of Physics, Hefei Teachers College, Hefei 230061, China
Abstract The entanglement property of two identical atoms, initially entangled in Bell states, coupled to a single-mode cavity is considered. Based on the reduced non-perturbative quantum master equation method, the entanglement evolution of the two atoms with decay is investigated beyond the conventional rotating-wave approximation. We show that the counter-rotating wave terms, usually neglected, have a great influence on the disentanglement behaviour of the system. The phenomena of entanglement sudden death and entanglement sudden birth will occur. In addition, we show that the entanglement can be strengthened by introducing the dipole--dipole interaction of the two atoms.
Received: 25 February 2009
Revised: 27 March 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 60678022 and
10704001), the Specialized Research Fund for the Doctoral Program of
Higher Education (Grant No 20060357008), Anhui Provincial Natural
Science Foundation of China (Grant No 070412060), the Key Program of
the Education Department of Anhui Province of China (Grant No
KJ2008A28ZC) and Anhui Key Laboratory of Information Materials and
Devices (Anhui University of China).
Cite this article:
Yang Qing(杨青), Yang Ming(杨名), Li Da-Chuang(李大创), and Cao Zhuo-Liang(曹卓良) Entanglement evolution of a two-qubit system with decay beyond the rotating-wave approximation 2009 Chin. Phys. B 18 4662
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