华东师范大学学报（自然科学版） ›› 2025, Vol. 2025 ›› Issue (3): 19-25.doi: 10.3969/j.issn.1000-5641.2025.03.003

• 物理学与电子学 • 上一篇    下一篇

压缩态辅助的量子非破坏性弱力测量

贾蕊旗, 韦展鹏, 张可烨*()   

  1. 华东师范大学 物理与电子科学学院, 上海　200241
  • 收稿日期:2024-04-24 出版日期:2025-05-25 发布日期:2025-05-28
  • 通讯作者: 张可烨 E-mail:kyzhang@phy.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金 (11974116); 中央高校基本科研业务费

Squeezing-assisted quantum non-demolition measurements theory of weak-force detection

Ruiqi JIA, Zhanpeng WEI, Keye ZHANG*()   

  1. School of Physics and Electronic Science, East China Normal University, Shanghai　200241, China
  • Received:2024-04-24 Online:2025-05-25 Published:2025-05-28
  • Contact: Keye ZHANG E-mail:kyzhang@phy.ecnu.edu.cn

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摘要：

在量子精密测量装置中, 散粒噪声和测量反作用噪声这两种源于量子机制的噪声很难被同时削弱, 导致其测量精度会止步于标准量子极限 (standard quantum limit, SQL). 使用压缩态光场和量子非破坏性测量法 (quantum non-demolition measurement, 简称QND测量) 是突破这一极限的两种常用方法. 基于常见的腔光力学弱力探测系统, 提出了一种将这两种方法结合起来的理论方案, 相较于单独使用QND测量法, 可以更深地突破SQL, 获得更好的测量精度.

关键词: 量子精密测量, 腔光力学, 量子非破坏性测量, 压缩态

Abstract:

In quantum precision metrology, simultaneously weakening two types of noise based on quantum mechanisms, i.e., shot noise and measurement back-action noise, is challenging. Thus, the measurement precision is limited by the standard quantum limit(SQL). Two commonly used methods for surpassing this limit are to employ quantum squeezed light fields or quantum non-demolition(QND) measurements. This paper proposes an approach that combines these two methods within a typical cavity optomechanical weak-force-detection system. Compared with solely performing QND measurements, this integrated method surpasses the SQL significantly, thereby achieving superior measurement precision.

Key words: quantum precision metrology, cavity optomechanics, quantum non-demolition measurement, squeezed state

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