"New generations of research grade clocks based on single atoms … can measure the change in the Earth’s gravity that comes from lifting the clock by a bit more than one foot."https://warontherocks.com/2017/11/leap-quantum-technology-primer-national-security-professionals/ …
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I'm sure I saw a presentation about the tech where it was claimed to be nearly practical. IIRC you'd need accuracy of about 10^-13 m/s^2, which is better than the present tech, but seemingly achievable
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