#quantum speed limits

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A caesium-fountain clock tower in a metrology-institute clock hall, a small luminous cloud of launched atoms caught partway up the evacuated flight tube, well below its ballistic apex, with the launch chamber's shutter still swinging closed beneath it

How Good Can a Clock Ever Be?

Quantum mechanics prices a clock's resolution in energy spread; general relativity charges every clock rent on the energy it carries. This paper separates the rent you can calibrate away from the part you cannot, and ends the series on the floor that remains.

By Brecht Corbeel · October 1, 2026 · 14 min read

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