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·         Cambridge University Scientists’ have squeezed light in a manner thought impossible.

·         During the process they reduced the electromagnetic noise associated with light to less than that measured in the complete absence of light.

·         Squeezing light means to remove the noise.

·         Noise is essentially tiny fluctuations at a quantum level, depending on how intense the light is.

·         Under Heisenberg’s Uncertainty Principle we can’t eliminate the noise, but we can shift it around, increasing the precision of the amplitude (size of the wave) at the expense of its phase consistency (knowing when it peaks), or vice versa.
...
Further reading: http://www.iflscience.com/physics/scientists-achieve-impossible-way-squeeze-light/

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Squeezed states of light theory.
-Squeezed states are of high interest since they show a ‘squeezed’
uncertainty, which can be used to improve the sensitivity of measurement
devices beyond the usual quantum noise limits including those impacted
by quantum back-action noise.
-Squeezed states of light can be produced
with nonlinear optics ( the branch of optics that describes the behavior of light , that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light. Observed only at very high light intensities (values of the electric field comparable to interatomic electric fields, typically 108 V/m) such as those provided by lasers.) and used in many proof of principle
experiments to research their potential for improving the sensitivity
of laser interferometers.
- squeezed light is likely to significantly contribute
to the new field of gravitational-wave astronomy.

Fig. 1: Schematic of a laser interferometer for the detection of gravitational waves. Here, squeezed vacuum states are injected and overlapped with the bright field at the central beam splitter to improve the sensitivitITY

https://www.youtube.com/watch?v=3aOs37PEL2k

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💡 for measurement to reduce quantum noise
💡 as gravitational wave detector (use large-scale interferometers)
- to identify the tiny signals from gravity waves

https://www.youtube.com/watch?v=xb2MD_06ogY

🌻actually, squeezed light is not widely used because it is plagued with many difficulties such as optical losses bring a squeezed state of light closer to a coherent state, i.e. tend to destroy the nonclassical properties.

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In the nutshell, Squeezing is a strange phenomenon of quantum physics. It creates a very specific form of light which is "low-noise" and is potentially useful in technology designed to pick up faint signals, such as the detection of gravitational waves. The standard approach to accomplish this feat involves firing an intense laser beam at a material, usually a non-linear crystal, which produces the desired effect.

1. Scientist squeeze light one particle at a time https://www.youtube.com/watch?v=3aOs37PEL2k

2.The wave hunters-04: Squeezed light
https://www.youtube.com/watch?v=XZIlDPTnhic
pic source: http://www.aei.mpg.de/1943309/15dbsqueezing