另一方面，量子退相干是量子信息领域走向实际应用的重要障碍之一。
On the other hand, quantum decoherence is one of the key obstacles in the applications of quantum information.
传统的刻画量子退相干的方法都是采取了马尔科夫近似，即认为环境对系统不存在记忆效应。
Traditionally, the quantum decoherence process is mathematically solved by using Markov approximation. That is, the environment has no memory effect on the system.
在实现信息处理的过程中，量子态叠加原理、量子纠缠和量子退相干等基本原理和基本概念应当充分考虑。
Some fundamental principles, such as the principle of quantum state superposition, quantum entangled state and quantum decoherence etc.
在有限温度环境内，量子约束动力学及其追踪控制可使退相干系统的相干性稳定一段时间。
Quantum 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.
阐释了退相干解释的纲领，并在退相干解释纲领下，分析了经典世界中的定域性和量子力学中的非充分决定论的因果关系。
This paper explains the programme of decoherence. And under the programme of decoherence, it also analyzes the locality in the classical world and causation without determinism in quantum mechanics.
如果能够控制系统的退相干，我们就可以实现量子通讯和量子计算机，因此是否能够控制退相干具有十分重要的意义。
If we can control freely system decoherence, we can realize quantum communications and quantum computer. So it is a primary signification to whether control decoherence or not.
本论文对在不同近似下的退相干动力学给出了清晰的图像并对如何保持量子相干性有一定的帮助。
This thesis may give a clear clue of decoherence dynamics under different approximations and how to preserve quantum coherence in the steady state.
介绍了量子力学的退相干理论。
我们不但实验观测到宏观量子系统中的量子跳跃，还可以利用量子跳跃现象来研究固体中普遍存在的两能级系统及其引起的超导量子比特中的退相干。
In addition, quantum jumps can serve as a useful tool to investigate the properties of the two-level systems that are ubiquitous in solid-state systems.
为此，我们研究了相位退相干和振幅退相干环境对纠缠、量子隐形传态和量子非局域性质的影响。
We investigate the entanglement, quantum teleportation, and quantum non-locality affected by the phase de-coherence and amplitude de-coherence of the environment.
退相干是现代量子信息与量子计算中普遍存在的本质问题，对于研究它是当今物理界的一个重点和难点。
Decoherence is a universal essential problem in modern quantum information and quantum computation. It is significant and difficult to study this problem in modern physical field.
退相干是现代量子信息与量子计算中普遍存在的本质问题，对于研究它是当今物理界的一个重点和难点。
Decoherence is a universal essential problem in modern quantum information and quantum computation. It is significant and difficult to study this problem in modern physical field.
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