论文标题
与测量设备无关的纠缠见证人中的检测漏洞
Detection loophole in measurement-device-independent entanglement witness
论文作者
论文摘要
每个纠缠的量子状态总是存在纠缠见证人。纠缠证人操作员的期望值负面价值保证对应状态的纠缠，因为所涉及的测量设备是完美的，即执行的测量结果实际上构成了正在考虑的国家的证人经营者。在现实情况下，有两种可能的测量方法可以将过程远离理想的过程。首先，可以执行错误的测量结果，其次，在正确实施测量运算符时，检测过程是嘈杂的。纠缠的证人容易发生这两种瑕疵。引入了与测量设备依赖的纠缠见证人的概念，以消除第一个问题。我们在与测量设备依赖的纠缠见证人的背景下分析了“检测漏洞”，该证人涉及第二个不精确测量问题的问题。我们在纠缠依赖性的纠缠证人方案中获得了纠缠证人功能的上限，在下面保证了给定的非理想探测器效率的纠缠，这可能涉及丢失的事件和黑暗的数量。
There always exists an entanglement witness for every entangled quantum state. Negativity of the expectation value of an entanglement witness operator guarantees entanglement of the corresponding state, given that the measurement devices involved are perfect, i.e., the performed measurements actually constitute the witness operator for the state under consideration. In a realistic situation, there are two possible ways of measurements to drive the process away from the ideal one. Firstly, wrong measurements may be performed, and secondly, while the measurement operators are implemented correctly, the detection process is noisy. Entanglement witnesses are prone to both of these imperfections. The concept of measurement-device-independent entanglement witnesses was introduced to remove the first problem. We analyze the "detection loophole" in the context of measurement-device-independent entanglement witnesses, which deal with the second problem of imprecise measurements. We obtain an upper bound on the entanglement witness function in the measurement-device-independent entanglement witness scenario, below which entanglement is guaranteed for given non-ideal detector efficiencies, that can involve both lost events and dark counts.
