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Quantum correlations between light and the kilogram-mass mirrors of LIGO.
Nature. 2020 07; 583(7814):43-47.Nat

Abstract

The measurement of minuscule forces and displacements with ever greater precision is inhibited by the Heisenberg uncertainty principle, which imposes a limit to the precision with which the position of an object can be measured continuously, known as the standard quantum limit1-4. When light is used as the probe, the standard quantum limit arises from the balance between the uncertainties of the photon radiation pressure applied to the object and of the photon number in the photoelectric detection. The only way to surpass the standard quantum limit is by introducing correlations between the position/momentum uncertainty of the object and the photon number/phase uncertainty of the light that it reflects5. Here we confirm experimentally the theoretical prediction5 that this type of quantum correlation is naturally produced in the Laser Interferometer Gravitational-wave Observatory (LIGO). We characterize and compare noise spectra taken without squeezing and with squeezed vacuum states injected at varying quadrature angles. After subtracting classical noise, our measurements show that the quantum mechanical uncertainties in the phases of the 200-kilowatt laser beams and in the positions of the 40-kilogram mirrors of the Advanced LIGO detectors yield a joint quantum uncertainty that is a factor of 1.4 (3 decibels) below the standard quantum limit. We anticipate that the use of quantum correlations will improve not only the observation of gravitational waves, but also more broadly future quantum noise-limited measurements.

Authors+Show Affiliations

LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA. haocunyu@mit.edu.LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA. mcculler@mit.edu.LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA.OzGrav, Australian National University, Canberra, Australian Capital Territory, Australia.LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA.LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

32612226

Citation

Yu, Haocun, et al. "Quantum Correlations Between Light and the Kilogram-mass Mirrors of LIGO." Nature, vol. 583, no. 7814, 2020, pp. 43-47.
Yu H, McCuller L, Tse M, et al. Quantum correlations between light and the kilogram-mass mirrors of LIGO. Nature. 2020;583(7814):43-47.
Yu, H., McCuller, L., Tse, M., Kijbunchoo, N., Barsotti, L., & Mavalvala, N. (2020). Quantum correlations between light and the kilogram-mass mirrors of LIGO. Nature, 583(7814), 43-47. https://doi.org/10.1038/s41586-020-2420-8
Yu H, et al. Quantum Correlations Between Light and the Kilogram-mass Mirrors of LIGO. Nature. 2020;583(7814):43-47. PubMed PMID: 32612226.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quantum correlations between light and the kilogram-mass mirrors of LIGO. AU - Yu,Haocun, AU - McCuller,L, AU - Tse,M, AU - Kijbunchoo,N, AU - Barsotti,L, AU - Mavalvala,N, AU - ,, Y1 - 2020/07/01/ PY - 2020/02/03/received PY - 2020/05/04/accepted PY - 2020/7/3/entrez PY - 2020/7/3/pubmed PY - 2020/7/3/medline SP - 43 EP - 47 JF - Nature JO - Nature VL - 583 IS - 7814 N2 - The measurement of minuscule forces and displacements with ever greater precision is inhibited by the Heisenberg uncertainty principle, which imposes a limit to the precision with which the position of an object can be measured continuously, known as the standard quantum limit1-4. When light is used as the probe, the standard quantum limit arises from the balance between the uncertainties of the photon radiation pressure applied to the object and of the photon number in the photoelectric detection. The only way to surpass the standard quantum limit is by introducing correlations between the position/momentum uncertainty of the object and the photon number/phase uncertainty of the light that it reflects5. Here we confirm experimentally the theoretical prediction5 that this type of quantum correlation is naturally produced in the Laser Interferometer Gravitational-wave Observatory (LIGO). We characterize and compare noise spectra taken without squeezing and with squeezed vacuum states injected at varying quadrature angles. After subtracting classical noise, our measurements show that the quantum mechanical uncertainties in the phases of the 200-kilowatt laser beams and in the positions of the 40-kilogram mirrors of the Advanced LIGO detectors yield a joint quantum uncertainty that is a factor of 1.4 (3 decibels) below the standard quantum limit. We anticipate that the use of quantum correlations will improve not only the observation of gravitational waves, but also more broadly future quantum noise-limited measurements. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/32612226/Quantum_correlations_between_light_and_the_kilogram-mass_mirrors_of_LIGO L2 - https://doi.org/10.1038/s41586-020-2420-8 DB - PRIME DP - Unbound Medicine ER -