Improving Broadband Displacement Detection with Quantum Correlations

Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. The role of quantum mechanics in the metrological limits of interferometers has a rich history, and a large number of techniques to surpass conventional limits hav...

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Published inPhysical review. X Vol. 7; no. 2; p. 021008
Main Authors Kampel, N. S., Peterson, R. W., Fischer, R., Yu, P.-L., Cicak, K., Simmonds, R. W., Lehnert, K. W., Regal, C. A.
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LanguageEnglish
Published College Park American Physical Society 01.04.2017
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Abstract Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. The role of quantum mechanics in the metrological limits of interferometers has a rich history, and a large number of techniques to surpass conventional limits have been proposed. In a typical measurement configuration, the trade-off between the probe’s shot noise (imprecision) and its quantum backaction results in what is known as the standard quantum limit (SQL). In this work, we investigate how quantum correlations accessed by modifying the readout of the interferometer can access physics beyond the SQL and improve displacement sensitivity. Specifically, we use an optical cavity to probe the motion of a silicon nitride membrane off mechanical resonance, as one would do in a broadband displacement or force measurement, and observe sensitivity better than the SQL dictates for our quantum efficiency. Our measurement illustrates the core idea behind a technique known as variational readout, in which the optical readout quadrature is changed as a function of frequency to improve broadband displacement detection. And, more generally, our result is a salient example of how correlations can aid sensing in the presence of backaction.
AbstractList Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. The role of quantum mechanics in the metrological limits of interferometers has a rich history, and a large number of techniques to surpass conventional limits have been proposed. In a typical measurement configuration, the trade-off between the probe’s shot noise (imprecision) and its quantum backaction results in what is known as the standard quantum limit (SQL). In this work, we investigate how quantum correlations accessed by modifying the readout of the interferometer can access physics beyond the SQL and improve displacement sensitivity. Specifically, we use an optical cavity to probe the motion of a silicon nitride membrane off mechanical resonance, as one would do in a broadband displacement or force measurement, and observe sensitivity better than the SQL dictates for our quantum efficiency. Our measurement illustrates the core idea behind a technique known as variational readout, in which the optical readout quadrature is changed as a function of frequency to improve broadband displacement detection. And, more generally, our result is a salient example of how correlations can aid sensing in the presence of backaction.
ArticleNumber 021008
Author Lehnert, K. W.
Fischer, R.
Cicak, K.
Kampel, N. S.
Simmonds, R. W.
Peterson, R. W.
Regal, C. A.
Yu, P.-L.
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Snippet Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. The role of quantum...
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StartPage 021008
SubjectTerms Atomic clocks
Broadband
Configurations
Displacement
Efficiency
Force measurement
Gravitational waves
Interferometers
Light beams
Membranes
Microscopes
Quadratures
Quantum efficiency
Quantum mechanics
Query languages
Sensitivity
Shot noise
Silicon nitride
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Title Improving Broadband Displacement Detection with Quantum Correlations
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