Spin-orbit coupling plays an important role in both fundamental physics and technological applications. Precise estimation of the spin-orbit coupling is necessary for accurate designing across various physical setups, such as solid-state devices and quantum hardware. Here, we exploit quantum features in a one-dimensional quantum wire for estimating the Rashba spin-orbit coupling with enhanced sensitivity beyond the capability of classical probes. The Heisenberg limited enhanced precision is achieved across a wide range of parameters and does not require fine tuning. Such an advantage is directly related to the gap-closing nature of the probe across the entire relevant range of parameters. This provides a clear advantage over conventional criticality-based quantum sensors in which quantum-enhanced sensitivity can only be achieved through fine tuning around the phase-transition point. We have demonstrated quantum-enhanced sensitivity for both single-particle and interacting many-body probes. In addition to extending our results to thermal states and the multiparameter scenario, we have provided a measurement basis to perform close to the ultimate precision.

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• Quantum sensing
• Spin-orbit coupling