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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: New quantum motion sensor may make GPS redundant, or does it?
Date: Wed, 14 Aug 2024 05:38:36 GMT
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The mother of all motion sensors
Quantum sensing milestone draws closer exquisitely accurate, GPS-free navigation
 https://www.sciencedaily.com/releases/2024/08/240813131917.htm

Source:
 DOE/Sandia National Laboratories
Summary:
 Researchers have used silicon photonic microchip components to perform a quantum sensing technique called atom interferometry, an ultra-precise way of measuring acceleration.
It is the latest milestone toward developing a kind of quantum compass for navigation when GPS signals are unavailable.

High-performance silicon photonic single-sideband modulators for cold-atom interferometry.
 Science Advances, 2024; 10 (28) DOI: 10.1126/sciadv.ade4454

pdf:
 https://www.science.org/doi/pdf/10.1126/sciadv.ade4454

Won't fit in a smartphone though, so we still need GPS..
but nice if GPS sats are shot out of orbit or if GPS signals are jammed
when drones and planes and boats are used in a war situation.