The quantum Bell-Ziv-Zakai bounds and Heisenberg limits for waveform estimation

Abstract

We propose quantum versions of the Bell-Ziv-Zakai lower bounds on the error in multiparameter estimation. As an application we consider measurement of a time-varying optical phase signal with stationary Gaussian prior statistics and a power law spectrum $\sim 1/|\omega {|}^p$, with $p>1$. With no other assumptions, we show that the mean-square error has a lower bound scaling as $1/{\mathcal{N}}^{2(p-1)/(p+1)}$, where $\mathcal{N}$ is the time-averaged mean photon flux. Moreover, we show that this accuracy is achievable by sampling and interpolation, for any $p>1$. This bound is thus a rigorous generalization of the Heisenberg limit, for measurement of a single unknown optical phase, to a stochastically varying optical phase.

18 pages, 6 figures, comments welcome

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