论文标题
量子开关中不确定因果秩序的无限依赖性认证
Device-independent certification of indefinite causal order in the quantum switch
论文作者
论文摘要
量子理论与操作顺序不确定的情况兼容。对这种情况的实验研究，所有这些情况都基于一个称为量子开关的过程，都提供了根据实验室中使用的设备上的假设条件的无限期因果秩序的证明。但是，是否可以通过违反贝尔的不平等现象的贝尔非局部认证，类似于贝尔非局部的认证？先前的结果表明，如果隔离开关，则答案为负。但是，在这里，我们提出了一种不平等，可以在量子开关中与设备独立认证的不确定因果秩序，并在存在额外的跨间距性分离观察者的情况下，这是一个假设，即认为是不可能的超亮型和倒角影响的。
Quantum theory is compatible with scenarios in which the order of operations is indefinite. Experimental investigations of such scenarios, all of which have been based on a process known as the quantum switch, have provided demonstrations of indefinite causal order conditioned on assumptions on the devices used in the laboratory. But is a device-independent certification possible, similar to the certification of Bell nonlocality through the violation of Bell inequalities? Previous results have shown that the answer is negative if the switch is considered in isolation. Here, however, we present an inequality that can be used to device-independently certify indefinite causal order in the quantum switch in the presence of an additional spacelike-separated observer under an assumption asserting the impossibility of superluminal and retrocausal influences.
