Patra, Abhinav, Aiello, Lorenzo, Ejlli, Aldo, Griffiths, William L., James, Alasdair L., Kuntimaddi, Nikitha, Kwon, Ohkyung, Schwartz, Eyal, Vahlbruch, Henning, Vermeulen, Sander M., Kokeyama, Keiko  ORCID: https://orcid.org/0000-0002-2896-1992, Dooley, Katherine L. ORCID: https://orcid.org/0000-0002-1636-0233 and Grote, Hartmut ORCID: https://orcid.org/0000-0002-0797-3943
2025.
Broadband limits on stochastic length fluctuations from a pair of table-top interferometers.
Physical Review Letters
135
, 101402.
10.1103/61j9-cjkk
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Abstract
The Quantum-Enhanced Space-Time (QUEST) experiment consists of a pair of colocated power recycled Michelson interferometers, each designed to have a broadband, shot-noise-limited displacement sensitivity of 2×10−19 m/√Hz from 1 to 200 MHz. Here, we present the first results of QUEST, with a search up to 80 MHz, that set new upper limits on correlated length fluctuations from 13 to 80 MHz, constituting the first broadband constraints for a stochastic gravitational wave background at these frequencies. In a coincident observing run of 104 s, the averaging of the cross-correlation spectra between the two interferometer signals resulted in a strain sensitivity of 3×10−20 1/√Hz, making QUEST the most sensitive table-top interferometric system to date.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | American Physical Society |
| ISSN: | 0031-9007 |
| Date of First Compliant Deposit: | 25 June 2025 |
| Date of Acceptance: | 18 June 2025 |
| Last Modified: | 03 Oct 2025 15:00 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/179312 |
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