Photon-Counting Interferometry to Detect Geontropic Space-Time Fluctuations with GQuEST

Vermeulen, Sander M.; Cullen, Torrey; Grass, Daniel; MacMillan, Ian A. O.; Ramirez, Alexander J.; Wack, Jeffrey; Korzh, Boris; Lee, Vincent S. H.; Zurek, Kathryn M.; Stoughton, Chris; McCuller, Lee

doi:10.1103/PhysRevX.15.011034

Photon-Counting Interferometry to Detect Geontropic Space-Time Fluctuations with GQuEST

Journal Article · Fri Feb 14 00:00:00 EST 2025 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.15.011034· OSTI ID:2516765

; ; ; ; ; ; Korzh, Boris; ; ; ; McCuller, Lee

The gravity from the quantum entanglement of space-time (GQuEST) experiment uses tabletop-scale Michelson laser interferometers to probe for fluctuations in space-time. We present a practicable interferometer design featuring a novel photon-counting readout method that provides unprecedented sensitivity, as it is not subject to the interferometric standard quantum limit. We evaluate the potential of this design to measure space-time fluctuations motivated by recent “geontropic” quantum gravity models. The accelerated accrual of Fisher information offered by the photon-counting readout enables GQuEST to detect the predicted quantum gravity phenomena within measurement times at least 100 times shorter than equivalent conventional interferometers. The GQuEST design, thus, enables a fast and sensitive search for signatures of quantum gravity in a laboratory-scale experiment.

Published by the American Physical Society 2025

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Research Organization:: Caltech; Caltech, JPL; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: US Department of Energy; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: 89243024CSC000002; AC02-07CH11359

OSTI ID:: 2516765

Alternate ID(s):: OSTI ID: 2349031

Report Number(s):: FERMILAB-PUB-24-0151-PPD; 011034

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 1 Vol. 15; ISSN PRXHAE; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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