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

Ma, Yiqiu and Miao, Haixing and Pang, Belinda Heyun and Evans, Matthew and Zhao, Chunnong and Harms, Jan and Schnabel, Roman and Chen, Yanbei (2017) Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement. Nature Physics, 13 (8). pp. 776-780. ISSN 1745-2473. doi:10.1038/nphys4118.

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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.

Item Type:Article
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URLURL TypeDescription DOIArticle ReadCube access Paper
Ma, Yiqiu0000-0001-7192-4874
Miao, Haixing0000-0003-2879-5821
Pang, Belinda Heyun0000-0002-5697-2162
Zhao, Chunnong0000-0001-5825-2401
Harms, Jan0000-0002-7332-9806
Schnabel, Roman0000-0003-2896-4218
Chen, Yanbei0000-0002-9730-9463
Alternate Title:Proposal for Gravitational-Wave Detection Beyond the Standard Quantum Limit via EPR Entanglement
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.
Group:TAPIR, Institute for Quantum Information and Matter, Astronomy Department
Funding AgencyGrant Number
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Australian Research CouncilDP120104676
Australian Research CouncilDP120100898
Deutsche Forschungsgemeinschaft (DFG)SCHN757/6
European Research Council (ERC)339897
Issue or Number:8
Record Number:CaltechAUTHORS:20170321-110739258
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75273
Deposited By: George Porter
Deposited On:15 May 2017 20:13
Last Modified:15 Nov 2021 16:32

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