A Broadband Squeezed Light Source for Table-Top Interferometry
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917402285965312 |
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| author | Bergamin, Fabio Kuntimaddi, Nikitha Patra, Abhinav Montoya, Stephanie Mehmet, Moritz Dooley, Katherine Grote, Hartmut Vahlbruch, Henning |
| author_facet | Bergamin, Fabio Kuntimaddi, Nikitha Patra, Abhinav Montoya, Stephanie Mehmet, Moritz Dooley, Katherine Grote, Hartmut Vahlbruch, Henning |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_08857 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Broadband Squeezed Light Source for Table-Top Interferometry Bergamin, Fabio Kuntimaddi, Nikitha Patra, Abhinav Montoya, Stephanie Mehmet, Moritz Dooley, Katherine Grote, Hartmut Vahlbruch, Henning Optics Quantum Physics 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. |
| title | A Broadband Squeezed Light Source for Table-Top Interferometry |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2508.08857 |