| Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit |
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| 引用本文： | 安钧鸿 王顺金 罗洪刚. Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit[J]. 中国物理快报, 2005, 22(12): 3009-3012 |
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| 作者姓名： | 安钧鸿 王顺金 罗洪刚 |
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| 作者单位： | [1]Department of Modern Physics, Lanzhou University, Lanzhou 730000 [2]Department of Physics, Sichuan University, Chengdu 610064 [3]Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 |
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| 基金项目： | Supported by the National Natural Science Foundation under Grant Nos 10375039, 90503008, and 10474103. |
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| 摘 要： |
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| 关 键 词： | 动态约束 跟踪控制 反馈效应 量子学 |
| 收稿时间： | 2005-07-06 |
| 修稿时间： | 2005-07-06 |
Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit |
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| AN Jun-Hong, WANG Shun-Jin, LUO Hong-Gang. Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit[J]. Chinese Physics Letters, 2005, 22(12): 3009-3012 |
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| Authors: | AN Jun-Hong WANG Shun-Jin LUO Hong-Gang |
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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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