🔄FROM THE ARCHIVE: For the first time, physicists measured fluctuations in the quantum realm.
Each of Advanced LIGO’s two detectors has a super-still 90-pound mirror at the end of a 2.5-mile-long tunnel. Here, a LIGO optics technician checks one of the mirrors.This article appeared inannual state of science issue as “Big Excitement Over Tiny Fluctuations.” Support our science journalism by becoming aThe Advanced Laser Interferometer Gravitational wave Observatory can measure giant ripples in space-time that race across the cosmos.
Mavalvala’s group set out to measure and control these quantum effects as a way to improve gravitational-wave detection. Advanced LIGO, housed in tunnels in Louisiana and Washington state, works by measuring how long it takes lasers to travel to a distant mirror. Gravitational waves — from neutron star collisions, or when black holes devour ordinary stars — can change the speed of the lasers’ trip.
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