#Bargmann superselection rule

Tagged Bargmann superselection rule · show all articles

A bright vacuum interferometer with two wavepacket paths about to recombine at a beamsplitter cube, one arm's readout lamp already lit

The Clock That Comes Back Wrong by Exactly Its Mass

Translate, boost, undo both: the classical bookkeeping says nothing happened. The quantum phase disagrees, by an amount fixed by mass — and this program runs that leftover into a real fight over what an interferometer measures.

By Brecht Corbeel · September 26, 2026 · 23 min read

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