Mechanically detecting and avoiding the quantum fluctuations of a microwave field

J. Suh; A. J. Weinstein; C. U. Lei; E. E. Wollman; S. K. Steinke; P. Meystre; A. A. Clerk; K. C. Schwab

doi:10.1126/science.1253258

Mechanically detecting and avoiding the quantum fluctuations of a microwave field

J. Suh, A. J. Weinstein, C. U. Lei, E. E. Wollman, S. K. Steinke, P. Meystre, A. A. Clerk, K. C. Schwab

Physics

Research output: Contribution to journal › Article › peer-review

127 Scopus citations

Abstract

Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are called "back-action evading" or "quantum nondemolition" detection. We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 T 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 T 0.7 dB below the mechanical zero-point fluctuations. Measurements of this type will find utility in ultrasensitive measurements of weak forces and nonclassical states of motion.

Original language	English (US)
Pages (from-to)	1262-1265
Number of pages	4
Journal	Science
Volume	344
Issue number	6189
DOIs	https://doi.org/10.1126/science.1253258
State	Published - 2014

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T1 - Mechanically detecting and avoiding the quantum fluctuations of a microwave field

AU - Suh, J.

AU - Weinstein, A. J.

AU - Lei, C. U.

AU - Wollman, E. E.

AU - Steinke, S. K.

AU - Meystre, P.

AU - Clerk, A. A.

AU - Schwab, K. C.

PY - 2014

Y1 - 2014

N2 - Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are called "back-action evading" or "quantum nondemolition" detection. We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 T 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 T 0.7 dB below the mechanical zero-point fluctuations. Measurements of this type will find utility in ultrasensitive measurements of weak forces and nonclassical states of motion.

AB - Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are called "back-action evading" or "quantum nondemolition" detection. We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 T 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 T 0.7 dB below the mechanical zero-point fluctuations. Measurements of this type will find utility in ultrasensitive measurements of weak forces and nonclassical states of motion.

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Mechanically detecting and avoiding the quantum fluctuations of a microwave field

Abstract

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