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Phase-controlled atom-photon entanglement in a three-level Λ -type closed-loop atomic system |
| Ali Mortezapoura, Zeinab Kordib, Mohammad Mahmoudib |
a Institute for Advanced Studies in Basic Sciences, P. O. Box 45195-159, Zanjan, Iran;
b Physics Department, University of Zanjan, P. O. Box 45195-313, Zanjan, Iran |
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Abstract We study the entanglement of dressed atom and its spontaneous emission in a three-level Λ -type closed-loop atomic system in multi-photon resonance condition and beyond it. It is shown that the von Neumann entropy in such a system is phase-dependent, and it can be controlled by either intensity or relative phase of applied fields. It is demonstrated that for the special case of Rabi frequency of applied fields, the system is disentangled. In addition, we take into account the effect of Doppler broadening on the entanglement and it is found that a suitable choice of laser propagation direction allows us to obtain the steady state degree of entanglement (DEM) even in the presence of Doppler effect.
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Received: 08 July 2012
Revised: 11 November 2012
Accepted manuscript online:
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PACS:
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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42.50.Dv
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(Quantum state engineering and measurements)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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Corresponding Authors:
Mohammad Mahmoudi
E-mail: mahmoudi@znu.ac.ir
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Cite this article:
Ali Mortezapour, Zeinab Kordi, Mohammad Mahmoudi Phase-controlled atom-photon entanglement in a three-level Λ -type closed-loop atomic system 2013 Chin. Phys. B 22 060310
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