Multiple-phase quantum interferometry -- real and apparent gains of measuring all the phases simultaneously

• URL: http://arxiv.org/abs/2107.10863v3
• Date: Tue, 4 Jan 2022 13:10:35 GMT
• Title: Multiple-phase quantum interferometry -- real and apparent gains of measuring all the phases simultaneously
• Authors: Wojciech Gorecki, Rafal Demkowicz-Dobrzanski
• Abstract summary: 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. 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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