Equation 98 · Part 1 · The Bit Comes Back Before the Bearing
Symbol N
What this part means
N 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
N 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 N→Article meaning
The passage around this formula
…the hole’s own state is traced over, contributes an addition to the total that adds like an independent sample rather than like a decoded codeword. This is the standard-quantum-limit regime of parameter estimation: for N independent, identically prepared probes each with per-probe Fisher information , the achievable variance scales as 1/(N ) , in contrast to the quadratically better Heisenberg scaling available only when probes are used coherently together [ 13 ] . Modeling the collected radiation up to…
Learn the underlying idea
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
- [12] Statistical Distance and the Geometry of Quantum States ↗
- [13] Quantum-Enhanced Measurements: Beating the Standard Quantum Limit ↗
These citations provide research context; check each source for the exact claim it supports.