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
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
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.
(Decoherence; open systems; quantum statistical methods)
引用本文:
AN Jun-Hong;WANG Shun-Jin;LUO Hong-Gang;. Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit[J]. 中国物理快报, 2005, 22(12): 3009-3012.
AN Jun-Hong, WANG Shun-Jin, LUO Hong-Gang,. Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit. Chin. Phys. Lett., 2005, 22(12): 3009-3012.
2005, Vol. 22 
