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arXiv 2104.02047quant-phcond-mat.mes-hall
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用于增强基于量子比特的量子噪声光谱的本征和诱导量子猝灭

Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy

Yu-Xin Wang, Aashish A. Clerk

摘要:

我们讨论了如何标准的$T_2$为基础的量子传感和噪声光谱协议往往会引起无意淬火的系统或环境被探测:有一个有效的突然变化,在开始的环境哈密顿的传感协议。这些猝灭对初始环境状态非常敏感,并导致传感器量子位演化中可观察到的变化。我们展示了如何使用这些新功能来直接访问环境响应属性。这使得能够实现用于直接测量熔池温度的方法和诊断非热平衡状态的方法。我们还讨论了技术,允许一个故意控制和调制这种淬火物理,使浴光谱功能的重建。还讨论了非高斯量子浴的扩展,因为我们的想法直接适用于基于标准金刚石NV中心的量子传感平台。

英文摘要:

We discuss how standard $T_2$-based quantum sensing and noise spectroscopy protocols often give rise to an inadvertent quench of the system or environment being probed: there is an effective sudden change in the environmental Hamiltonian at the start of the sensing protocol. These quenches are extremely sensitive to the initial environmental state, and lead to observable changes in the sensor qubit evolution. We show how these new features can be used to directly access environmental response properties. This enables methods for direct measurement of bath temperature, and methods to diagnose non-thermal equilibrium states. We also discuss techniques that allow one to deliberately control and modulate this quench physics, which enables reconstruction of the bath spectral function. Extensions to non-Gaussian quantum baths are also discussed, as is the direct applicability of our ideas to standard diamond NV-center based quantum sensing platforms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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