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A Lower Bound on the Entanglement in the Jaynes--Cummings Model |
| CAI Jin-Fang;ZOU Jian |
| Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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CAI Jin-Fang, ZOU Jian 2005 Chin. Phys. Lett. 22 1584-1587 |
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Abstract The entanglement between an atom and field is investigated by using the Jaynes--Cummings model. The initial atomic state is supposed in a mixed state and the field is in a squeezed state. The lower bound on the entanglement quantified by concurrence is calculated. It is found that the entanglement with the atom being initially in a mixed state can be larger than that with the atom being initially in a pure state. The entanglement is not a monotone function of the squeezing parameter r of the field and it achieves the maximum for certain r and then decreases with further increase of r.
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| Keywords:
03.65.Ud
03.67.-a
42.50.Dv
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Published: 01 July 2005
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.-a
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(Quantum information)
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42.50.Dv
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(Quantum state engineering and measurements)
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