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Broadband Limits on Stochastic Length Fluctuations from a Pair of Table-Top Interferometers
Abhinav Patra1, Lorenzo Aiello1, Aldo Ejlli1
1Cardiff University, Gravity Exploration Institute, Cardiff CF24 3AA, United Kingdom.
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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/sqrt[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 10^{4} s, the averaging of the cross-correlation spectra between the two interferometer signals resulted in a strain sensitivity of 3×10^{-20} 1/sqrt[Hz], making QUEST the most sensitive table-top interferometric system to date.
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