Back-action-evading measurements of nanomechanical motion

被引：201

作者：

Hertzberg, J. B. ^{[2
,3
]}

Rocheleau, T. ^{[2
]}

Ndukum, T. ^{[2
]}

Savva, M. ^{[2
]}

Clerk, A. A. ^{[4
]}

Schwab, K. C. ^{[1
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

[2] Cornell Univ, Dept Phys, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA

[3] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[4] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

来源：

NATURE PHYSICS | 2010年 / 6卷 / 03期

基金：

美国国家科学基金会;

关键词：

QUANTUM LIMIT; OSCILLATOR; CAVITY;

D O I：

10.1038/NPHYS1479

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When carrying out ultrasensitive continuous measurements of position, one must ultimately confront the fundamental effects of detection back-action. Back-action forces set a lower bound on the uncertainty in the measured position, the 'standard quantum limit' (SQL). Recent measurements of nano-and micromechanical resonators are rapidly approaching this limit. Making measurements with sensitivities surpassing the SQL will require a new kind of approach: back-action-evading (BAE), quantum non-demolition measurement techniques. Here we realize a BAE measurement based on the parametric coupling between a nanomechanical and a microwave resonator. We demonstrate for the first time BAE detection of a single quadrature of motion with sensitivity four times the quantum zero-point motion of the mechanical resonator. We identify a limiting parametric instability inherent in BAE measurement, and describe how to improve the technique to surpass the SQL and permit the formation of squeezed states of motion.

引用

页码：213 / 217

页数：5

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