Multiple-phase quantum interferometry -- real and apparent gains of measuring all the phases simultaneously
arXiv:2107.10863 · doi:10.1103/PhysRevLett.128.040504
Abstract
We characterize operationally meaningful quantum gains in a paradigmatic model of lossless multiple-phase interferometry and stress insufficiency of the analysis based solely on the concept of quantum Fisher information. We show that the advantage of the optimal simultaneous estimation scheme amounts to a constant factor improvement when compared with schemes where each phase is estimated separately -- contrary to a widely cited results claiming a better precision scaling in terms of the number of phases involved.
arXiv comment5+15 pages, 5 figures
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