Squeezed states of light

In quantum physics, light is in a squeezed state[1] if its electric field strength Ԑ for some phases has a quantum uncertainty smaller than that of a coherent state. The term squeezing thus refers to a reduced quantum uncertainty. To obey Heisenberg's uncertainty relation, a squeezed state must also have phases at which the electric field uncertainty is anti-squeezed, i.e. larger than that of a coherent state. Since 2019, the gravitational-wave observatories LIGO and Virgo employ squeezed laser light, which has significantly increased the rate of observed gravitational-wave events.[2][3][4]

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  2. ^ Tse, M.; Yu, Haocun; Kijbunchoo, N.; Fernandez-Galiana, A.; Dupej, P.; Barsotti, L.; Blair, C. D.; Brown, D. D.; Dwyer, S. E.; Effler, A.; Evans, M. (December 5, 2019). "Quantum-Enhanced Advanced LIGO Detectors in the Era of Gravitational-Wave Astronomy". Physical Review Letters. 123 (23): 231107. Bibcode:2019PhRvL.123w1107T. doi:10.1103/physrevlett.123.231107. hdl:1721.1/136579.2. ISSN 0031-9007. PMID 31868462.
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  4. ^ Abbott, R. (2021). "GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run". Physical Review X. 11 (2): 021053. arXiv:2010.14527. Bibcode:2021PhRvX..11b1053A. doi:10.1103/PhysRevX.11.021053. S2CID 225094244.