Equation 41 · The Bit Comes Back Before the Bearing
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Symbol g
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is the quantum Fisher information of the radiation’s reduced state with respect to g ; it carries units of , i.e. inverse radians squared, and since g is already dimensionless, is a pure number. is the alignment tolerance the observer has decided to demand, also in radians, and has units of time [ 12 ] . This bound is achievable asymptotically by the symmetric logarithmic derivative measurement; nothing here claims it is achieved by any specific realizable circuit, only that it is the correct floor no circuit can beat.
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