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∣h1⟩|h_1\rangle

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Assume for the moment that |h0h_0⟩\rangle and |h1h_1⟩\rangle are pure, normalized, and prepared with equal prior probability. Define their trace distinguishability

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h1h_1

Symbol h_1

h1h_1 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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∣h1⟩|h_1\rangle

Equation 7 · Evolutionary Physics

How Fast Can a Horizon Learn Which Path You Took?

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

Assume for the moment that |h0h_0⟩\rangle and |h1h_1⟩\rangle are pure, normalized, and prepared with equal prior probability. Define their trace distinguishability

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