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单步操作量子资源理论

One-Shot Operational Quantum Resource Theory.

作者信息

Liu Zi-Wen, Bu Kaifeng, Takagi Ryuji

机构信息

Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.

Center for Theoretical Physics and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

出版信息

Phys Rev Lett. 2019 Jul 12;123(2):020401. doi: 10.1103/PhysRevLett.123.020401.

Abstract

A fundamental approach for the characterization and quantification of all kinds of resources is to study the conversion between different resource objects under certain constraints. Here we analyze, from a resource-nonspecific standpoint, the optimal efficiency of resource formation and distillation tasks with only a single copy of the given quantum state, thereby establishing a unified framework of one-shot quantum resource manipulation. We find general bounds on the optimal rates characterized by resource measures based on the smooth max- or min-relative entropies and hypothesis testing relative entropy, as well as the free robustness measure, providing them with general operational meanings in terms of optimal state conversion. Our results encompass a wide class of resource theories via the theory-dependent coefficients we introduce, and the discussions are solidified by important examples, such as entanglement, coherence, superposition, magic states, asymmetry, and thermal nonequilibrium.

摘要

对各类资源进行表征和量化的一种基本方法是研究在特定约束条件下不同资源对象之间的转换。在此,我们从资源非特异性的角度分析仅给定单份量子态时资源形成和提纯任务的最优效率,从而建立一次性量子资源操纵的统一框架。我们发现,基于光滑最大或最小相对熵以及假设检验相对熵的资源度量以及自由鲁棒性度量所表征的最优速率的一般界限,从最优态转换的角度为它们赋予了一般操作意义。通过我们引入的依赖于理论的系数,我们的结果涵盖了广泛的资源理论类别,并且通过诸如纠缠、相干性、叠加、魔术态、不对称性和热非平衡等重要示例使讨论更加具体。

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