Quantum Relativity

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A dual-species test-mass capsule falling through the lower reach of a drop-tower bore, still a hand's width above the catch tube's open padded collar, with two mu-metal shield cylinders ringing the bore on either side

The Corner of the Equivalence Principle No Experiment Has Touched

Sort quantum free-fall tests into a five-part basis and four slots fill with real numbers. Paper No. 9 shows the fifth, free fall for an entangled two-species state, has never been measured — and cannot be, by any experiment done on separate systems.

By Brecht Corbeel · September 24, 2026 · 13 min read

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