A broadband squeezed light source for table-top interferometry
Abstract
We report on the characterisation of one of two broadband squeezed light sources (SLSs) 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 200MHz, and squeezed light will be employed with the goal to reduce the shot noise by 6dB at frequencies inside the linewidth of the optical parametric amplifier (OPA). We directly observed up to 6.8dB of squeezing and maintained at least 3dB of squeezing across the full 100MHz measurement bandwidth. After accounting for the dark noise contribution, the inferred squeezing level increased to 8.6dB. Our SLS is based on a hemilithic OPA with a 43.6mm round-trip optical length and a linewidth of 138(2)MHz, making it the broadest-linewidth device to date among those suitable for long-term integration with interferometers operating at a wavelength of 1064nm.
Details
- Organisation(s)
-
QuantumFrontiers
- External Organisation(s)
-
Cardiff University
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
- Type
- Article
- Journal
- New journal of physics
- Volume
- 27
- Pages
- 125005
- No. of pages
- 1
- ISSN
- 1367-2630
- Publication date
- 24.12.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- General Physics and Astronomy
- Electronic version(s)
-
https://doi.org/10.1088/1367-2630/ae2987 (Access:
Open
)
https://doi.org/10.48550/arXiv.2508.08857 (Access: Open )
