Chin. Phys. Lett.  2005, Vol. 22 Issue (12): 3009-3012    DOI:
Original Articles |
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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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.
Keywords: 03.67.Pp      03.65.Yz     
Published: 01 December 2005
PACS:  03.67.Pp (Quantum error correction and other methods for protection against decoherence)  
  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2005/V22/I12/03009
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