论文标题
量子增强的多普勒激光雷达
Quantum-enhanced Doppler lidar
论文作者
论文摘要
我们提出了一个量子增强的激光雷达系统，以估计靶标的径向速度，该径向速度采用挤压和频率纠缠的信号和惰轮。我们使用具有相同脉冲持续时间和能量的连贯状态将其性能与经典协议进行比较，这表明量子资源在对象速度的估计中提供了精确的增强。我们确定了三个不同的参数制度，其特征是挤压和频率纠缠的量。在其中两个中，假设没有光子损失，则可以达到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是频率分辨的光子计数。 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 $50\%$.
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 $50\%$.
