论文标题
量子库的非马克维亚感应
Non-Markovian Sensing of a Quantum Reservoir
论文作者
论文摘要
量子传感使用传感器的量子资源探索协议，以实现高度敏感的物理量测量。常规方案通常使用统一动力来将数量编码为传感器状态。为了测量量子储层的光谱密度，该量子储层在控制储层引起的对微观系统的反应性方面起着至关重要的作用，我们提出了一种非空缺编码的光学传感方案。尽管编码的单身动态反过来降低了量子资源，但我们出人意料地找到了使编码时间成为提高精度并使传感器挤压的资源成为超越射击噪声限制的资源的机制。我们的结果表明，这是由于形成传感器 - 保存状态。我们的方案丰富了量子传感的家族，提供了一种有效的方法来测量量子储存库，并可能为反矫正控制提供有见地的支持。
Quantum sensing explores protocols using the quantum resource of sensors to achieve highly sensitive measurement of physical quantities. The conventional schemes generally use unitary dynamics to encode quantities into sensor states. In order to measure the spectral density of a quantum reservoir, which plays a vital role in controlling the reservoir-caused decoherence to microscopic systems, we propose a nonunitary-encoding optical sensing scheme. Although the nonunitary dynamics for encoding in turn degrades the quantum resource, we surprisingly find a mechanism to make the encoding time a resource to improve the precision and to make the squeezing of the sensor a resource to surpass the shot-noise limit. Our result shows that it is due to the formation of a sensor-reservoir bound state. Enriching the family of quantum sensing, our scheme gives an efficient way to measure the quantum reservoir and might supply an insightful support to decoherence control.
