Squeezing the quantum noise of a gravitational-wave detector below the standard quantum limit

Quantum limit
DOI: 10.1126/science.ado8069 Publication Date: 2024-09-19T18:00:23Z
AUTHORS (172)
ABSTRACT
The Heisenberg uncertainty principle dictates that the position and momentum of an object cannot be simultaneously measured with arbitrary precision, giving rise to apparent limitation known as standard quantum limit (SQL). Gravitational-wave detectors use photons continuously measure positions freely falling mirrors so are affected by SQL. We investigated performance Laser Interferometer Gravitational-Wave Observatory (LIGO) after experimental realization frequency-dependent squeezing designed surpass For LIGO Livingston detector, we found upgrade reduces noise below SQL a maximum three decibels between 35 75 hertz while achieving broadband sensitivity improvement, increasing overall detector during astrophysical observations.
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