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arXiv 1708.03090quant-ph
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相干与扰动的互补关系

Complementarity Relation for Coherence and Disturbance

Gautam Sharma, Arun Kumar Pati

摘要:

量子测量必然会对物理系统的状态产生扰动。一旦我们进行了完整的测量,系统就会经历退相干并失去其相干性。如果没有扰动,国家就保持了它的所有连贯性。因此,很自然地会问,在对一个状态造成的扰动和它的相干性之间是否存在权衡。利用相干性的相对熵,提出了一种相干扰动互补关系。对于二分态,我们证明了量子相干性、纠缠和扰动之间的互补关系。类似的关系也适用于二分态的量子相干性、量子不和谐和扰动。讨论了不同量子信道下单比特态的相干性和扰动之间的折衷关系。

英文摘要:

Quantum measurements necessarily disturb the state of physical system. Once we perform a complete measurement, the system undergoes decoherence and loses its coherence. If there is no disturbance, the state retains all of its coherence. It is therefore natural to ask if there is trade-off between disturbance caused to a state and its coherence. We present a coherence disturbance complementarity relation using the relative entropy of coherence. For bipartite states we prove a complementarity relation between the quantum coherence, entanglement and disturbance. Similar relation also holds for quantum coherence, quantum discord and disturbance for a bipartite state. We illustrate the trade-off between the coherence and the disturbance for single qubit state for various quantum channels.

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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