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Equation 56 · Part 2 · The Bit Comes Back Before the Bearing

Symbol g

ρrad(g)\rho_{\mathrm{rad}}(g)
gg

What this part means

g is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

g is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…can be simulated away entirely if the two parties already share a suitable reference system, and cannot be worked around at all if they do not [ 11 ] . Absent such a shared frame, whatever the radiation reveals about g has to be extracted from the asymmetry of ρrad(g)\rho_{\mathrm{rad}}(g) relative to the group — a quantity that scrambling, left to its own devices, does not have any particular reason to concentrate quickly. The qubit’s logical content survives scrambling because nothing about being “close to |0⟩\rangle…

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Sources cited in the surrounding passage

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