Symbol psi
psi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Why this formula appears here
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,
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Symbol g
an angle: dimensionless, periodic, and physically read as “which way the compass points” relative to the hole’s spin axis.
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Read this expression with the definitions, units, and assumptions supplied by the article.
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Published contexts (1)
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Equation 3 · Evolutionary Physics
The Bit Comes Back Before the Bearing
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
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,
Meanings in this article
- : an angle: dimensionless, periodic, and physically read as “which way the compass points” relative to the hole’s spin axis.