Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 2017 | Submitted + Supplemental Material
Journal Article Open

Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement

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.

Additional Information

© 2017 Macmillan Publishers Limited, part of Springer Nature. Received 06 October 2016; Accepted 30 March 2017; Published online 15 May 2017. Research of Y.M., B.H.P. and Y.C. is supported by NSF grant PHY-1404569 and PHY-1506453, as well as the Institute for Quantum Information and Matter, a Physics Frontier Center. H.M. is supported by the Marie-Curie Fellowship and UK STFC Ernest Rutherford Fellowship. C.Z. would like to thank the support of Australian Research Council Discovery Project DP120104676 and DP120100898. R.S. is supported by DFG grant SCHN757/6 and by ERC grant 339897 ('Mass Q'). Author Contributions: Y.M., H.M. and Y.C. formulated the idea; Y.M. performed the analysis of the idea and wrote the initial draft, which was later revised by Y.C.; B.H.P. checked Y.M.'s calculation; M.E., J.H., R.S. and C.Z. provided important experimental parameters for doing theoretical analysis and gave valuable comments on Y.M.'s calculations and initial/revised draft. The authors declare no competing financial interests.

Attached Files

Submitted - 1612.06934.pdf

Supplemental Material - nphys4118-s1.pdf

Files

1612.06934.pdf
Files (2.5 MB)
Name Size Download all
md5:546af754be2ce363589f93691a07d9b8
1.8 MB Preview Download
md5:43043d3fddefe0a1137b8ddad38a471e
641.6 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023