arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2401.04825quant-phphysics.atom-phphysics.optics
收藏

Exceptional-point 传感器未提供根本性的信噪比增强

Exceptional-point Sensors Offer No Fundamental Signal-to-Noise Ratio Enhancement

Hudson A. Loughlin, Vivishek Sudhir

AI总结:

该研究指出奇异点(EP)传感器的共振频率灵敏度提升会被量子、热等基本噪声抵消,测量广义力的精度与靠近EP的程度无关,其优势仅存于技术噪声限制场景,还提出了带相敏增益、在基本噪声下仍有优势的EP传感器方案。

摘要:

Exceptional-point(EP,奇异点)传感器的特征是其共振频率会随外部扰动呈现平方根形式的分岔,这一特性催生了大量将这类系统用于传感应用的设想。但这种灵敏度优势是否会被系统中的额外噪声抵消,目前仍存在公开争议。我们证明,EP传感器测量广义力时的不精确度,与其工作点靠近EP的程度无关。原因在于传感器中源于量子涨落和热涨落的根本性频率噪声,其增长幅度恰好抵消了EP附近共振频率灵敏度提升带来的收益。因此EP传感器的优势仅局限于受技术噪声限制的传感场景。最后,我们概述了一种带有相敏增益的EP传感器,该传感器即使受基本噪声限制也具备优势。

英文摘要:

Exceptional-point (EP) sensors are characterized by a square-root resonant frequency bifurcation in response to an external perturbation. This has lead numerous suggestions for using these systems for sensing applications. However, there is an open debate as to whether or not this sensitivity advantage is negated by additional noise in the system. We show that an EP sensor's imprecision in measuring a generalized force is independent of its operating point's proximity to the EP. That is because frequency noises of fundamental origin in the sensor -- due to quantum and thermal fluctuations -- increase in a manner that exactly cancels the benefit of increased resonant frequency sensitivity near the EP. So the benefit of EP sensors is limited to the regime where sensing is limited by technical noises. Finally, we outline an EP sensor with phase-sensitive gain that does have an advantage even if limited by fundamental noises.

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。

↑