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Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit |
| AN Jun-Hong1;WANG Shun-Jin1,2;LUO Hong-Gang1,3 |
| 1Department of Modern Physics, Lanzhou University, Lanzhou 730000
2Department of Physics, Sichuan University, Chengdu 610064
3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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AN Jun-Hong, WANG Shun-Jin, LUO Hong-Gang 2005 Chin. Phys. Lett. 22 3009-3012 |
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Abstract Constraint dynamics and tracking control strategy to stabilize the coherence of a decoherent system is applied to a dissipative qubit system at a finite temperature. By using a control field dependent on the dynamical state of the qubit via the constraint equations, we show that the coherence of the qubit can be preserved within a finite time duration by the feedback effect of the qubit system. It is also shown that the temperature plays a negative role to this coherence control strategy.
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| Keywords:
03.67.Pp
03.65.Yz
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Published: 01 December 2005
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| PACS: |
03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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