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arXiv 1503.06303quant-ph
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最大相干混合态:最大相干性与混合性的互补性

Maximally coherent mixed states: Complementarity between maximal coherence and mixedness

Uttam Singh, Manabendra Nath Bera, Himadri Shekhar Dhar, Arun Kumar Pati

摘要:

量子相干性是量子资源理论研究中的一个关键因素,也是量子技术设计和实现的主要促进因素。然而,量子相干性的丰富性受到环境噪声的严重限制,环境噪声由量子系统中的信息损失(以其纯度衡量)表示。在这项工作中,我们推导出量子系统的混合性对它所能拥有的量子相干性的限制。我们得到了一个分析的折衷之间的两个量,上限的最大量子相干性在一个系统中固定的混合。这就产生了一类量子态,“最大相干混合态”,其相干性在任何纯度保持操作下都不能进一步增加。对于上述类型的状态,量子相干性和混合性满足互补关系,这对于理解开放量子系统中资源和噪声之间的相互作用至关重要。

英文摘要:

Quantum coherence is a key element in topical research on quantum resource theories and a primary facilitator for design and implementation of quantum technologies. However, the resourcefulness of quantum coherence is severely restricted by environmental noise, which is indicated by the loss of information in a quantum system, measured in terms of its purity. In this work, we derive the limits imposed by the mixedness of a quantum system on the amount of quantum coherence that it can possess. We obtain an analytical trade-off between the two quantities that upperbound the maximum quantum coherence for fixed mixedness in a system. This gives rise to a class of quantum states, "maximally coherent mixed states," whose coherence cannot be increased further under any purity-preserving operation. For the above class of states, quantum coherence and mixedness satisfy a complementarity relation, which is crucial to understand the interplay between a resource and noise in open quantum systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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