相干性资源理论——超越态
摘要
我们将最近提出的相干性(或叠加性)资源理论 [Baumgratz, Cramer & Plenio, Phys. Rev. Lett. 113:140401; Winter & Yang, Phys. Rev. Lett. 116:120404] 推广到这样的情形:不仅自由的(“非相干”)资源,而且被操作的对象也是量子操作,而非态。特别地,我们讨论了量子信道相干容量的信息论概念,并针对酉操作情况证明了其单字母公式。然后我们转向模拟信道的相干代价,并证明了作用于 维系统的酉操作和一般信道的可达性结果;我们表明如果允许非相干操作,秩为 的极大相干态总是足以作为资源。我们还展示了信道模拟代价的下界,使我们能够得出结论:操作中存在束缚相干性,即具有非零实现代价但零相干容量的映射;这与态形成对比,态不表现出束缚相干性。
引用
@article{arxiv.1704.03710,
title = {Resource Theory of Coherence - Beyond States},
author = {Khaled Ben Dana and María García Díaz and Mohamed Mejatty and Andreas Winter},
journal= {arXiv preprint arXiv:1704.03710},
year = {2017}
}
备注
V1 6 pages; v2 is improved in every respect - it has more pages (6>10), more figures (0>2), more authors (3>4), and of course many more results; v3 has several smaller improvements, it is the final version accepted by the journal; v4 includes an erratum as ancillary file, correcting Proposition 3 (journal reference of the erratum: Phys. Rev. A 96, 059903 (2017); DOI: 10.1103/PhysRevA.96.059903)