A protocol for global multiphase estimation

Abstract

Global estimation strategies allow to extract information on a phase or a set of phases without any prior knowledge, which is, instead, required for local estimation strategies. We devise a global multiphase protocol based on Holevo's estimation theory and apply it to the case of digital estimation, i.e. we estimate the phases in terms of the mutual information between them and the corresponding estimators. In the single-phase scenario, the protocol encompasses two specific known optimal strategies. We extend them to the simultaneous estimation of two phases and evaluate their performance. Then, we retrieve the ultimate digital bound on precision when a generic number of phases is simultaneously estimated. We show that in the multiphase strategy there is only a constant quantum advantage with respect to a sequence of independent single-phase estimations. This extends a recent similar result, which settled a controversy on the search for the multiphase enhancement.

References in corpus (8)

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• Tutorial: Optical quantum metrology
• Does nonlinear metrology offer improved resolution? Answers from quantum information theory
• Bayesian Quantum Multiphase Estimation Algorithm
• Multiple-phase quantum interferometry -- real and apparent gains of measuring all the phases simultaneously
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Cited by in corpus (7)

• Quantum metrology in the finite-sample regime
• First-principles construction of symmetry-informed quantum metrologies
• Mutual Information Bounded by Fisher Information
• Heisenberg scaling based on population coding
• Quantum multiphase estimation
• The Cramér-Rao approach and global quantum estimation of bosonic states
• Multiparameter quantum estimation with Gaussian states: efficiently evaluating Holevo, RLD and SLD Cramér-Rao bounds