Broadband limits on stochastic length fluctuations from a pair of table-top interferometers

Abstract

The Quantum-Enhanced Space-Time (QUEST) experiment consists of a pair of co-located Power Recycled Michelson Interferometers, each designed to have a broadband, shot-noise limited displacement sensitivity of $2\times 10^{-19}$ $m/\sqrt{\mathrm{Hz}}$ from 1 to 200 MHz. Here we present the first results of QUEST 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 $3\times 10^{-20}$ $1/\sqrt{\mathrm{Hz}}$ at 40 MHz, making QUEST the most sensitive table-top interferometric system to date.

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• Prospects for High-Frequency Gravitational-Wave Detection with GEO600
• Signatures of Correlation of Spacetime Fluctuations in Laser Interferometers
• Testing the Starobinsky model of inflation with resonant cavities