时间反演和超分辨相位测量
Time-reversal and super-resolving phase measurements
摘要：
我们证明了在没有纠缠态的情况下的相位超分辨率。关键的见解是利用量子力学固有的时间反演对称性：我们的理论表明，与准备纠缠态相反，\emph{measure}是可能的。我们的方法是稳健的，只需要表现出经典干涉的光子：我们使用标准激光器和光子计数器，用三个，四个和六个光子实验证明了高可见度的相位超分辨率。我们的六光子实验展示了迄今为止报道的最佳相位超分辨率，具有高可见度和分辨率。
英文摘要：
We demonstrate phase super-resolution in the absence of entangled states. The key insight is to use the inherent time-reversal symmetry of quantum mechanics: our theory shows that it is possible to \emph{measure}, as opposed to prepare, entangled states. Our approach is robust, requiring only photons that exhibit classical interference: we experimentally demonstrate high-visibility phase super-resolution with three, four, and six photons using a standard laser and photon counters. Our six-photon experiment demonstrates the best phase super-resolution yet reported with high visibility and resolution.
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