Quantum-enhanced sensing of spin-orbit coupling without fine-tuning

• URL: http://arxiv.org/abs/2411.00598v1
• Date: Fri, 01 Nov 2024 14:00:23 GMT
• Title: Quantum-enhanced sensing of spin-orbit coupling without fine-tuning
• Authors: Bin Yi, Abolfazl Bayat, Saubhik Sarkar,
• Abstract summary: Heisenberg limited enhanced precision is achieved across a wide range of parameters. We have demonstrated quantum enhanced sensitivity for both single particle and interacting many-body probes.
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• Abstract: 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 1D 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 advantage is directly related to the gap-closing nature of the probe across the entire relevant range of parameters. This provides 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 multi-parameter scenario, we have provided an measurement basis to perform close to the ultimate precision.

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