Quantum-enhanced Doppler lidar
Quantum-enhanced Doppler lidar
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DOI：
10.1038/s41534-022-00662-9
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发表时间：
2022-03
影响因子：
7.6
通讯作者：
M. Reichert;R. Di Candia;M. Win;M. Sanz
中科院分区：
文献类型：
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作者：
M. Reichert;R. Di Candia;M. Win;M. Sanz
我们提出了一种量子增强激光雷达系统来估计目标的径向速度，该系统利用压缩和频率纠缠的信号和空闲波束。我们将其性能与使用具有相同脉冲持续时间和能量的相干状态的经典协议进行了比较，表明量子资源在估计物体速度方面提供了精度提高。我们确定了以压缩量和频率纠缠为特征的三种不同的参数体系。在其中两种情况下，在没有光子损失的情况下，实现了超过标准量子极限的量子优势。此外，我们表明，在无损情况下获得这些结果的最佳测量方法是频率分辨光子计数。最后，我们考虑了光子损耗对高压缩状态的影响，在给定激光雷达到目标到激光雷达的往返透射率大于50%的情况下，光子损耗导致估计器方差大于3db的常数因子量子优势。
We propose a quantum-enhanced lidar system to estimate a target’s radial velocity, which employs squeezed and frequency-entangled signal and idler beams. We compare its performance against a classical protocol using a coherent state with the same pulse duration and energy, showing that quantum resources provide a precision enhancement in the estimation of the velocity of the object. We identify three distinct parameter regimes characterized by the amount of squeezing and frequency entanglement. In two of them, a quantum advantage exceeding the standard quantum limit is achieved assuming no photon losses. Additionally, we show that an optimal measurement to attain these results in the lossless case is frequency-resolved photon counting. Finally, we consider the effect of photon losses for the high-squeezing regime, which leads to a constant factor quantum advantage higher than 3 dB in the variance of the estimator, given a roundtrip lidar-to-target-to-lidar transmissivity larger than 50%.