Symbol t

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…$f_1$ , the achievable variance scales as 1/(N $f_1$) , in contrast to the quadratically better Heisenberg scaling available only when probes are used coherently together [ 13 ] . Modeling the collected radiation up to time t as contributing $N_\gamma(t)$ $\sim$ t/$\beta$ roughly independent quanta gives, as a stated phenomenological ansatz rather than a first-principles evaporation calculation, $F_Q(t) \;\approx\; f_1\,\frac{t}{\beta}, \qquad t_G(\delta) \;\approx\; \frac{\beta}{f_1\,\delta^2}$. This model has an explicit conservation ceiling built in: it cannot be extended past the compass’s own total…

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