[HN Gopher] Quantum entangled photons react to Earth's spin
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Quantum entangled photons react to Earth's spin
Author : wglb
Score : 29 points
Date : 2024-06-16 01:25 UTC (21 hours ago)
(HTM) web link (phys.org)
(TXT) w3m dump (phys.org)
| westurner wrote:
| > _" The core of the matter lays in establishing a reference
| point for our measurement, where light remains unaffected by
| Earth's rotational effect. Given our inability to halt Earth's
| from spinning, we devised a workaround: splitting the optical
| fiber into two equal-length coils and connecting them via an
| optical switch," explains lead author Raffaele Silvestri._
|
| > _By toggling the switch on and off, the researchers could
| effectively cancel the rotation signal at will, which also
| allowed them to extend the stability of their large apparatus.
| "We have basically tricked the light into thinking it's in a non-
| rotating universe," says Silvestri._
|
| "Experimental observation of Earth's rotation with quantum
| entanglement" (2024)
| https://www.science.org/doi/10.1126/sciadv.ado0215
|
| Sagnac interferometer:
| https://en.wikipedia.org/wiki/Sagnac_effect
| pottspotts wrote:
| This is a really great experiment. It's nice to see real work
| being done on the ground with these kinds of tests and write-ups.
| I am not a physicist but I imagine this could have implications
| for gravitational wave detection by improving LIGO's optical
| sensors, maybe optical sensors in general?
|
| Or maybe this could help with tracking time more accurately?
| Hopefully someone with knowledge can chime in with what this
| means in practice.
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