Equation 4 · The Bit Comes Back Before the Bearing
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Into this old hole go two systems. The first, A , is a two-dimensional qubit prepared in an arbitrary, unknown state and coupled to nothing the hole’s own symmetries track — a spectator, chosen so that its recovery is the cleanest possible test of the Hayden-Preskill mechanism on its own terms. The second, C , is a compass: a physical carrier prepared in a state | that transforms under a one-parameter group of rotations generated by a Hermitian charge , the same charge the hole’s own angular momentum is built from,
Sources cited in the article section
- [10] Transmission of a Cartesian Frame by a Quantum System ↗
- [8] Black Holes as Clouded Mirrors: the Hayden-Preskill Protocol with Symmetry ↗
- [7] Particle Creation by Black Holes ↗
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