论文标题
信息漂白，无隐藏定理和不确定的因果秩序
Information Bleaching, No-Hiding Theorem and Indefinite Causal Order
论文作者
论文摘要
信息漂白是指从物理系统初始状态中删除量子信息的任何物理过程。不隐藏的定理证明，如果信息从初始系统中丢失，则不能保留在两部分量子相关性中，必须在希尔伯特空间的其余部分中找到。我们表明，当隐藏地图在不确定因果秩序的存在下作用于输入状态时，可以将量子信息隐藏在相关性中。一个人可能会问，那会违反不隐藏的定理吗？我们分析了这个问题，并认为在扩展的希尔伯特空间中，它仍然会尊重无隐藏定理。我们还讨论了如何使用两个隐藏地图的叠加来掩盖量子信息。我们的结果在保留信息的忠诚度，量子相干性的保留和工作提取方面可能具有有趣的含义，并在存在两个不确定因果秩序的隐藏地图的情况下提取工作。此外，我们将隐藏地图应用于不确定的因果秩序的存在上的一半，并表明无法保留纠缠。最后，我们讨论了，即使量子纠缠被摧毁，在不确定的因果秩序下的纠缠忠诚度是非零的，并且可以接近一个。
The information bleaching refers to any physical process that removes quantum information from the initial state of the physical system. The no-hiding theorem proves that if information is lost from the initial system, then it cannot remain in the bipartite quantum correlation and must be found in the remainder of the Hilbert space. We show that when hiding map acts on the input state in the presence of indefinite causal order, then it is possible to hide quantum information in the correlation. One may ask, does it then violate the no-hiding theorem? We analyse this question and argue that in the extended Hilbert space, it will still respect the no-hiding theorem. We also discuss how to mask quantum information using superposition of two hiding maps. Our results can have interesting implications in preserving the fidelity of information, preservation of quantum coherence and work extraction in the presence of two hiding maps with indefinite causal order. Furthermore, we apply the hiding maps in the presence of indefinite causal order on half of an entangled pair and show that entanglement cannot be preserved. Finally, we discuss that even though quantum entanglement is destroyed, the entanglement fidelity under indefinite causal order is non-zero and can approach close to one.
