Quantum-Limited Time-Frequency Estimation through Mode-Selective Photon Measurement
Quantum-Limited Time-Frequency Estimation through Mode-Selective Photon Measurement
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DOI：
10.1103/physrevlett.121.090501
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发表时间：
2018-08-27
影响因子：
8.6
通讯作者：
Silberhorn, C.
中科院分区：
文献类型：
--
作者：
Donohue, J. M.;Ansari, V.;Silberhorn, C.
通过投影到复杂的光学模式分布上，可以以量子限制的精度估计物体之间的任意小的间隔，而不受重叠强度分布引起的不确定性的影响。在这里，我们将这些技术扩展到时间-频率域，使用模式选择性和频生成成形超快脉冲。我们实验解决时间和光谱分离的非相干混合物的单光子水平信号的十倍小于其光学带宽的精度提高了十倍以上的强度只有Cramer-Rao界限。
By projecting onto complex optical mode profiles, it is possible to estimate arbitrarily small separations between objects with quantum-limited precision, free of uncertainty arising from overlapping intensity profiles. Here we extend these techniques to the time-frequency domain using mode-selective sum-frequency generation with shaped ultrafast pulses. We experimentally resolve temporal and spectral separations between incoherent mixtures of single-photon level signals ten times smaller than their optical bandwidths with a tenfold improvement in precision over the intensity-only Cramer-Rao bound.