Quantum-enhanced Doppler lidar

• URL: http://arxiv.org/abs/2203.16424v2
• Date: Tue, 20 Dec 2022 14:46:58 GMT
• Title: Quantum-enhanced Doppler lidar
• Authors: Maximilian Reichert, Roberto Di Candia, Moe Z. Win, Mikel Sanz
• Abstract summary: We propose a quantum-enhanced lidar system to estimate a target's radial velocity. We show that quantum resources provide a precision enhancement in the estimation of the velocity of the object.
• Score: 13.480250801831525
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 $50\%$.

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