Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement
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Author(s)
Ma, Yiqiu
Miao, Haixing
Pang, Belinda Heyun
Evans, Matthew J
Zhao, Chunnong
Harms, Jan
Schnabel, Roman
Chen, Yanbei
Date Issued
May 2017
Journal
Nature Physics
Publisher
Springer Nature
Citation
Ma, Yiqiu, Haixing Miao, Belinda Heyun Pang, Matthew Evans, Chunnong Zhao, Jan Harms, Roman Schnabel, and Yanbei Chen. “Proposal for Gravitational-Wave Detection Beyond the Standard Quantum Limit through EPR Entanglement.” Nature Physics 13, 8 (May 2017): 776–780 © Macmillan Publishers Limited, part of Springer Nature
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Original manuscript
Abstract
In continuously monitored systems the standard quantum limit is given by the trade-off between shot noise and back-action noise. In gravitational-wave detectors, such as Advanced LIGO, both contributions can be simultaneously squeezed in a broad frequency band by injecting a spectrum of squeezed vacuum states with a frequency-dependent squeeze angle. This approach requires setting up an additional long baseline, low-loss filter cavity in a vacuum system at the detector's site. Here, we show that the need for such a filter cavity can be eliminated, by exploiting Einstein-Podolsky-Rosen (EPR)-entangled signals and idler beams. By harnessing their mutual quantum correlations and the difference in the way each beam propagates in the interferometer, we can engineer the input signal beam to have the appropriate frequency-dependent conditional squeezing once the out-going idler beam is detected. Our proposal is appropriate for all future gravitational-wave detectors for achieving sensitivities beyond the standard quantum limit.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/NPHYS4118
