Experimental Realization of Criticality-Enhanced Global Quantum Sensing via Non-Equilibrium Dynamics

• URL: http://arxiv.org/abs/2501.04955v2
• Date: Mon, 13 Jan 2025 02:00:24 GMT
• Title: Experimental Realization of Criticality-Enhanced Global Quantum Sensing via Non-Equilibrium Dynamics
• Authors: Yefei Yu, Ran Liu, Guangming Xue, Chuhong Yang, Chenlu Wang, Jingning Zhang, Jiangyu Cui, Xiaodong Yang, Jun Li, Jiaxiu Han, Haifeng Yu,
• Abstract summary: We introduce a critical sensing scheme that mitigates critical slowing down by leveraging the non-equilibrium dynamics of a perturbed Ising spin model. Our work showcases the metrological applications empowered by non-equilibrium critical dynamics.
• Score: 9.322628084827743
• License:
• Abstract: Quantum critical systems offer promising advancements in quantum sensing and metrology, yet face limitations like critical slowing down and a restricted criticality-enhanced region. Here, we introduce a critical sensing scheme that mitigate critical slowing down by leveraging the non-equilibrium dynamics of a perturbed Ising spin model, coupled with an adaptive strategy to enlarge its sensing interval. We validate the proposed scheme on a superconducting quantum processor and demonstrate that our scheme achieves a Heisenberg scaling with respect to the encoding duration. Additionally, the adaptive strategy tunes the model to operate near its critical point with limited prior information about the parameter, enabling what is known as global sensing. Our work showcases the metrological applications empowered by non-equilibrium critical dynamics and hence opens up a pathway for devising critical quantum sensors.

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