Output three-mode entanglement via coherently prepared inverted Y-type atoms

doi:10.1088/1674-1056/23/4/044203

Abstract In this paper, the output quantum correlations of three fields interacting with inverted Y-type atoms inside a three-mode cavity are investigated. By numerically calculating the stationary noise spectra of the fields, we show that it is possible to generate the genuine tripartite continuous variable entanglement outside the cavity by coherently preparing the atoms in a superposition of the upper excited state and two ground states initially. Our numerical results demonstrate that both zero frequency entanglement and sideband frequency entanglement can be obtained under different initial coherent conditions. In addition, we investigate the thermal fluctuation effects on the quantum entanglement. It is found out that the entanglement occurring in a high frequency regime is more robust against thermal noise than the zero frequency entanglement, which may be useful for quantum communication.

Keywords: tripartite entanglement correlated spontaneous emission laser inverted Y-type atom

Received: 23 July 2013
Revised: 31 August 2013
Accepted manuscript online:

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	03.65.Ud	(Entanglement and quantum nonlocality)
	42.50.Lc	(Quantum fluctuations, quantum noise, and quantum jumps)
	03.67.Bg	(Entanglement production and manipulation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 1137418 and 11104163) and the Science Foundation of Three Gorges University, China (Grant No. KJ2011B019).

Corresponding Authors: Wang Fei
E-mail: feiwang202@163.com

About author: 42.50.Dv; 03.65.Ud; 42.50.Lc; 03.67.Bg

Cite this article:

Wang Fei (王飞), Qiu Jing (邱晶) Output three-mode entanglement via coherently prepared inverted Y-type atoms 2014 Chin. Phys. B 23 044203

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Output three-mode entanglement via coherently prepared inverted Y-type atoms

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