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OPTOMECHANICS

Squeezing hots up

Nature Physics volume 16, pages 710–711 (2020)Cite this article

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Squeezed light is useful for metrology and quantum information. An optomechanical squeezed light source that works at room temperature will facilitate the technological applications of quantum light.

The most common type of squeezed light source uses nonlinear processes in materials that exhibit a strong second-order optical nonlinearity. In a typical scenario3, a lithium niobate or potassium titanyl phosphate crystal is pumped at some frequency 2f by a strong optical field. Placing the crystal in an optical cavity that is resonant with frequency f results in a device called an optical parametric oscillator. Inside an optical parametric oscillator, the electromagnetic field is squeezed such that noise is suppressed by up to 3 dB for certain phases. Destructive interference between the noise in the light exiting the cavity and that in the field outside it results in squeezing that can, in principle, be arbitrarily strong: the largest observed squeezing value is approximately 15 dB (ref. 4).

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Fig. 1: Quantum noise in squeezed light.

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  1. Department of Physics, University of Malta, Msida, Malta

    André Xuereb

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  1. André Xuereb
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Correspondence to André Xuereb.

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Xuereb, A. Squeezing hots up. Nat. Phys. 16, 710–711 (2020). https://doi.org/10.1038/s41567-019-0770-7

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  • DOI: https://doi.org/10.1038/s41567-019-0770-7

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