论文标题
近地时空的纠缠增强量子范围
Entanglement-enhanced quantum ranging in the near-Earth spacetime
论文作者
论文摘要
我们提出了一个量子范围的协议，以确定观察者与近地弯曲时空视线的目标之间的距离。与量子照明方案不同，我们在这里采用多个量子假设测试来同时决定目标的存在和位置。在当前方案中，地球的重力会影响光子的传播和量子范围的性能。我们发现，在弯曲时空中，量子范围策略的最大潜在优势优于其平坦的时空对手。这是因为可以取消重力红移和蓝移对纠缠信号光子的影响，而热光子仅受到重力蓝移效果的影响。我们还表明，传输模式的数量可以促进量子范围任务的最大潜在优势。在弯曲时空中量子范围的最大潜在优势不能通过将范围分为多个切片来急剧升高。
We propose a quantum ranging protocol to determine the distance between an observer and a target at the line of sight in the near-Earth curved spacetime. Unlike the quantum illumination scheme, here we employ multiple quantum hypothesis testing to decide the presence and location of the target at the same time. In the present protocol, the gravity of the Earth influences the propagation of photons and the performance of quantum ranging. We find that the maximum potential advantages of the quantum ranging strategy in the curved spacetime outperform its flat spacetime counterpart. This is because the effect of gravitational red-shift and blue-shift on the entangled signal photons can be canceled out, while the thermal photons only suffers from the gravitational blue-shift effect. We also show that the number of transmitted modes can promote the maximum potential advantage of the quantum ranging tasks. The maximum potential advantage of quantum ranging in the curved spacetime can not be raised sharply by dividing the range into multiple slices.
