Experimental investigation of the no-signalling principle in parity-time symmetric theory using an open quantum system
Experimental investigation of the no-signalling principle in parity-time symmetric theory using an open quantum system
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使用开放量子系统对宇称时间对称理论中的无信号原理进行实验研究
DOI：
10.1038/nphoton.2016.144
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发表时间：
2016
期刊：
影响因子：
35
通讯作者：
Guo Guang-Can
中科院分区：
文献类型：
--
作者：
Tang Jian-Shun;Wang Yi-Tao;Yu Shang;He De-Yong;Xu Jin-Shi;Liu Bi-Heng;Chen Geng;Sun Yong-Nan;Sun Kai;Han Yong-Jian;Li Chuan-Feng;Guo Guang-Can
经典光学中宇称-时间（）对称性的实验进展是过去十年中最重要的成就，并激发了许多新的应用，如单向光传输、和单模激光器。然而，在量子体系中，一些有争议的效应被提出用于对称理论，例如，潜在的违反无信号原理。因此，了解对称理论是否与已确立的原则一致是很重要的。在这里，我们实验研究这个无信号的对称理论相关的问题，使用两个类似空间的分离纠缠光子，其中一个通过后选择的量子门，有效地模拟非对称演化。我们的结果表明，当只考虑成功对称演化的子空间时，可以模拟超光速的信息传输。然而，考虑到这个子空间只是整个厄米系统的一部分，关于对称演化是否成功的附加信息是必要的，它以最大光速传输到接收器，保持无信令原理。
The experimental progress achieved in parity–time () symmetry in classical optics,,,,,,,,,,,,, is the most important accomplishment in the past decade and stimulates many new applications, such as unidirectional light transport,,, and single-mode lasers,. However, in the quantum regime, some controversial effects are proposed for-symmetric theory,,,, for example, the potential violation of the no-signalling principle. It is therefore important to understand whether-symmetric theory is consistent with well-established principles. Here, we experimentally study this no-signalling problem related to the-symmetric theory using two space-like separated entangled photons, with one of them passing through a post-selected quantum gate, which effectively simulates a-symmetric evolution. Our results suggest that the superluminal information transmission can be simulated when the successfully-symmetrically evolved subspace is solely considered. However, considering this subspace is only a part of the full Hermitian system, additional information regarding whether the-symmetric evolution is successful is necessary, which transmits to the receiver at maximally light speed, maintaining the no-signalling principle.