Broadband quantum back action evading measurements of a resonant force

•Quantum measurements.•Back action and Standard Quantum Limit.•Back action evading.•Variational measurement: narrow band back action evading.•Dichromatic variational measurement: broad band back action evading. Quantum back action imposes fundamental sensitivity limits to the majority of quantum mea...

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Bibliographic Details
Published in:Physics letters. A 2022-02, Vol.424, p.127849, Article 127849
Main Authors: Vyatchanin, Sergey P., Matsko, Andrey B.
Format: Article
Language:English
Subjects:
Quantum optomechanics
Quantum theory of measurement
Quantum variational measurement
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Summary:•Quantum measurements.•Back action and Standard Quantum Limit.•Back action evading.•Variational measurement: narrow band back action evading.•Dichromatic variational measurement: broad band back action evading. Quantum back action imposes fundamental sensitivity limits to the majority of quantum measurements. The effect results from the unavoidable contamination of the measured parameter with the quantum noise of a meter. Back action evading measurements take advantage of the quantum correlations introduced by the system under study to the meter and allow overcoming the fundamental limitations. The measurements are frequently restricted in their bandwidth due to a finite response time of the system components. Here we show that probing a mechanical oscillator with a dichromatic field with frequencies separated by the oscillator frequency enables independent detection in two outputs and complete subtraction of the measurement noise associated with the quantum back action.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2021.127849