Straight Line of the Day: Scientists Are Going To Try To “Squeeze Light.” If They Can Do That…

Straight Line of the Day: Scientists are going to “squeeze light”. If they can do that…


To work, the LIGO mirrors need to be isolated from any background vibrations from the ground and nearby instruments. To achieve this, the mirror arrays are suspended by thin threads of glass. The entire system also needs to be placed in a vacuum. The detector is so sensitive that air molecules passing through the light beams are picked up as noise. The air pressure inside LIGO‘s vacuum chamber is less than a trillionth of an atmosphere, which is lower than intergalactic space.

To the limits of human engineering, the LIGO system is an isolated vacuum system where the only thing that can move the mirrors is gravity itself. It isn’t perfect, but it is very good. So good that things start to get weird. Even if the detector was perfectly isolated, and placed in a perfect vacuum, the detectors would still pick up noise. The system is so sensitive that can pick up quantum fluctuations in empty space.


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