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Thermal Entanglement in Superconducting Quantum-Interference-Device Qubits Coupled to Cavity Field |
| PAN Hai-Zhong;KUANG Le-Man |
| Department of Physics, Hunan Normal University, Changsha 410081 |
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| Cite this article: |
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PAN Hai-Zhong, KUANG Le-Man 2004 Chin. Phys. Lett. 21 424-427 |
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Abstract We investigate thermal entanglement in a superconducting-quantum-interference-device qubit coupled to a cavity field. We show that the entanglement can be manipulated by varying temperature and an effective controlling parameter B which depends on the external field and characteristic parameters of the system. We find that there exists a critical value of the controlling parameter Bc. Under a fixed temperature, increasing B can increase entanglement in the regime of B < Bc, while the entanglement decreases with increasing B in the regime of B > Bc.
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| Keywords:
03.67.-a
03.65.Ud
85.25.Dq
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Published: 01 March 2004
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| PACS: |
03.67.-a
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(Quantum information)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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