Symbol R
R 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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Why this formula appears here
For the compass, returned has to mean something else, because g is a continuous parameter and no channel can reproduce an unknown continuous value exactly. The honest promise is metrological: the same agent, using the same R , applies the best available measurement and estimator , and the achievable mean-squared error is bounded below by the quantum Cramér-Rao bound,
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Symbol C_t
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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Read this expression with the definitions, units, and assumptions supplied by the article.
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Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 35 · Evolutionary Physics
The Bit Comes Back Before the Bearing
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
For the compass, returned has to mean something else, because g is a continuous parameter and no channel can reproduce an unknown continuous value exactly. The honest promise is metrological: the same agent, using the same R , applies the best available measurement and estimator , and the achievable mean-squared error is bounded below by the quantum Cramér-Rao bound,
Equation guide → · Article →