Vacuum Squeezing of Solids: Macroscopic Quantum States Driven by Light Pulses

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Science  14 Mar 1997:
Vol. 275, Issue 5306, pp. 1638-1640
DOI: 10.1126/science.275.5306.1638

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Femtosecond laser pulses and coherent two-phonon Raman scattering were used to excite KTaO3 into a squeezed state, nearly periodic in time, in which the variance of the atomic displacements dips below the standard quantum limit for half of a cycle. This nonclassical state involves a continuum of transverse acoustic modes that leads to oscillations in the refractive index associated with the frequency of a van Hove singularity in the phonon density of states.

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