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Published January 2021 | Accepted Version + Published
Journal Article Open

Direct approach to realizing quantum filters for high-precision measurements

Abstract

Quantum noise sets a fundamental limit to the sensitivity of high-precision measurements. Suppressing it can be achieved by using nonclassical states and quantum filters, which modify both the noise and signal response. We find an approach to realizing quantum filters directly from their frequency-domain transfer functions, utilizing techniques developed by the quantum control community. It not only allows us to construct quantum filters that defy intuition, but also opens a path towards the systematic design of optimal quantum measurement devices. As an illustration, we show an optical realization of an active unstable filter with anomalous dispersion, proposed for improving the quantum-limited sensitivity of gravitational-wave detectors.

Additional Information

© 2021 American Physical Society. (Received 20 February 2020; revised 20 November 2020; accepted 14 December 2020; published 7 January 2021) We would like to thank R. Adhikari, D. Martynov, N. Yamamoto, LIGO AIC, and QNWG for fruitful discussions. J.B. is supported by STFC and School of Physics and Astronomy at the University of Birmingham. J.B. and H.M. acknowledge the additional support from the Birmingham Institute for Gravitational Wave Astronomy. H.M. has also been supported by UK STFC Ernest Rutherford Fellowship (Grant No. ST/M005844/11). Y.C. is supported by the Simons Foundation (Award Number 568762) and the National Science Foundation, through Grants PHY-1708212 and PHY-1708213.

Attached Files

Published - PhysRevA.103.013707.pdf

Accepted Version - 2002.07644.pdf

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Additional details

Created:
August 20, 2023
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October 23, 2023