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  • Open Access

Impulse measurements enhanced with squeezed readout light

Tsai-Chen Lee1,2,*, Jacob L. Beckey3,4,†, Giacomo Marocco1,‡, and Daniel Carney1,§

  • *Contact author: tsaichen_lee@berkeley.edu
  • †Contact author: jbeckey@illinois.edu
  • ‡Contact author: gmarocco@lbl.gov
  • §Contact author: carney@lbl.gov
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Phys. Rev. Research 7, 033041 – Published 8 July, 2025

DOI: https://doi.org/10.1103/kcm9-bqs8

Abstract

We quantify how squeezed light can reduce quantum measurement noise to levels below the standard quantum limit in impulse measurements with mechanical detectors. The broadband nature of the signal implies that frequency-dependent squeezing performs better than frequency-independent squeezing. We calculate the optimal scaling of the impulse sensitivity with the squeezing strength and quantify degradations due to photodetection losses. Even for lossless measurement, we find there exists a fundamental limit to the benefit of squeezing that depends only on the system's mechanical properties.

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Phys. Rev. Research 7, 033041– Published 8 July, 2025
  • Received 24 February 2025
  • Accepted 16 May 2025
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