Two-mode excited entangled coherent states and their entanglement properties
Zhou Dong-Lin(周冬林), and Kuang Le-Man(匡乐满)†
Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
Abstract This paper introduces two types of two-mode excited entangled coherent states (TMEECSs) $|\varPsi_{\pm}(\alpha,m,n)\rangle$, studies their entanglement characteristics, and investigates the influence of photon excitations on quantum entanglement. It shows that for the state $|\varPsi_{+}(\alpha,m,m)\rangle$ the two-mode photon excitations affect seriously entanglement character while the state $|\varPsi_{-}(\alpha,m,m)\rangle$ is always a maximally entangled state, and shows how such states can be produced by using cavity quantum electrodynamics and quantum measurements. It finds that the entanglement amount of the TMEECSs is larger than that of the single-mode excited entangled coherent states with the same photon excitation number.
Received: 01 April 2008
Revised: 24 August 2008
Accepted manuscript online:
(Entanglement measures, witnesses, and other characterizations)
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10775048 and
10325523), the National Fundamental Research Program of China (Grant
No 2007CB925204), and the Funds from the Education
Department of Hunan Province.
Cite this article:
Zhou Dong-Lin(周冬林), and Kuang Le-Man(匡乐满) Two-mode excited entangled coherent states and their entanglement properties 2009 Chin. Phys. B 18 1328
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