An upgrade to LIGO that comes from exploiting a quantum rule known as the Heisenberg uncertainty principle makes it easier to detect spacetime ripples.
An upgrade to one such observatory, LIGO, that comes from exploiting a quantum rule known as the Heisenberg uncertainty principle makes it easier to spot spacetime ripples that arise from some of the cosmos’s most violent events.than it would without the upgrade, researchers report in an upcoming issue ofTo look for gravitational waves, LIGO researchers rely on laser light that moves in a detector between mirrors placed four kilometers apart.
The solution, described in the new study, was to use quantum squeezing to reduce uncertainty in the laser’s intensity at low frequencies, while reducing the frequency uncertainty in higher-frequency measurements. Even next-generation gravitational wave observatories will benefit from the new result, says physicist Lisa Barsotti of MIT. “The beauty is you can do both. You can push the limit of what is possible from the technology of laser power and mirror , and then do squeezing on top of that.”
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