Quantum target ranging, which estimates a target position using entangled photon pairs, is known to offer an error-probability advantage over classical ranging strategies. Yet, realizing this advantage in practice remains challenging, as an existing receiver design relies on collective measurements and requires an impractically large number of quantum memories and linear passive components. In this work, we propose a target ranging protocol with hetero-homodyne detection, providing a practically implementable architecture that achieves quantum advantage in target ranging using only local measurements. Our protocol requires only one heterodyne setup, a single homodyne setup, a delay line, and an efficient classical postprocessing, making the implementation scalable and experimentally feasible. Our results establish a realistic framework for demonstrating quantum advantage in target ranging and contribute toward practical quantum radar systems.

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• Quantum metrology
• Quantum sensing