A Broadband Squeezed Light Source for Table-Top Interferometry
- URL: http://arxiv.org/abs/2508.08857v1
- Date: Tue, 12 Aug 2025 11:31:27 GMT
- Title: A Broadband Squeezed Light Source for Table-Top Interferometry
- Authors: Fabio Bergamin, Nikitha Kuntimaddi, Abhinav Patra, Stephanie Montoya, Moritz Mehmet, Katherine Dooley, Hartmut Grote, Henning Vahlbruch,
- Abstract summary: We report on the characterisation of one of two broadband squeezed light sources developed for the Quantum Enhanced Space-Time (QUEST) experiment.<n>QUEST consists of a pair of co-located, table-top, power-recycled Michelson interferometers designed to probe stationary space-time fluctuations.<n>Our squeezed light source is based on a hemilithic OPA with a 43.6 mm round-trip optical length and a linewidth of 138 MHz, making it the broadest-linewidth device to date among those suitable for long-term operation.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We report on the characterisation of one of two broadband squeezed light sources developed for the Quantum Enhanced Space-Time (QUEST) experiment, using balanced homodyne detection. QUEST consists of a pair of co-located, table-top, power-recycled Michelson interferometers designed to probe stationary space-time fluctuations. The interferometers are designed to be shot-noise limited in the frequency range from 1 to 200 MHz, and squeezed light will be employed with the goal to reduce the shot noise by 6 dB at frequencies inside the linewidth of the optical parametric amplifier (OPA). We directly observed up to 6.8 dB of squeezing and maintained at least 3 dB of squeezing across the full 100 MHz measurement bandwidth. After accounting for the dark noise contribution, the inferred squeezing level increased to 8.6 dB. Our squeezed light source is based on a hemilithic OPA with a 43.6 mm round-trip optical length and a linewidth of 138 MHz, making it the broadest-linewidth device to date among those suitable for long-term operation.
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