基于手性波导的驱动耗散系统中的量子增强传感
Quantum-enhanced sensing in a driven-dissipative system via chiral waveguide
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中文总结 AI 辅助
该研究针对量子传感器受环境耗散影响性能的问题，研究由手性波导耦合的驱动耗散二能级系统，建立可实验实现的测量协议，实现了灵敏度增强且制备时间仅随系统大小线性增长，获得实用量子优势。
中文摘要 AI 辅助
量子传感器可达到经典传感器无法实现的精度，但与环境相互作用产生的耗散会大幅降低其性能，因此利用耗散并研究驱动耗散系统的传感性能以获得实用量子优势至关重要。本文研究了一个由失谐频率相干驱动的二能级系统，该系统连接手性波导，其兼具相互作用媒介和热库的作用。我们通过分析证明，该系统的稳态对弱失谐强度的估计灵敏度增强，且探针制备时间仅随系统大小线性增长，因此即使纳入制备时间，增强的灵敏度仍得以维持。我们进一步建立了可实验实现的测量协议，波导的手性有助于控制灵敏度增强的精度和范围。
英文摘要
Quantum sensors can achieve precision unattainable by classical sensors. However, dissipation coming from interaction with the environment can greatly degrade the performance of quantum sensors. Therefore, it is crucial to attempt harnessing dissipation to our advantage and investigate the sensing performance of driven-dissipative systems to gain practical quantum advantages. In this paper, we study a system of two-level systems driven coherently at a detuned frequency, and importantly, connected to a chiral waveguide that serves both as an interaction mediator and a bath. We show analytically that the steady state of such a system shows enhanced sensitivity to estimate weak detuning strength while the probe preparation time only grows linearly with system size. Therefore, the enhanced sensitivity is sustained even when the preparation time is incorporated. We further establish measurement protocols to achieve such sensitivity that are experimentally implementable. The chirality of the waveguide helps us to control both precision and range of enhanced sensitivity.
