Equation 54 · Part 1 · The Bit Comes Back Before the Bearing
Symbol hat J
What this part means
hat J 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
hat J is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol hat J→Article meaning
The passage around this formula
What the covariance also does, though, is forbid the radiation from leaking coherence between different eigenspaces of to an observer who has not independently fixed a frame. Kitaev, Mayers, and Preskill made the resource cost explicit: a superselection rule restricting accessible operations to those commuting with a group can be simulated away entirely if the two parties already share a suitable reference…
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A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
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