Related papers: Quantum asymmetry and noisy multi-mode interferometry

Quantum asymmetry and noisy multi-mode interferometry

URL: http://arxiv.org/abs/2107.11057v2
Date: Wed, 12 Apr 2023 17:27:58 GMT
Title: Quantum asymmetry and noisy multi-mode interferometry
Authors: Francesco Albarelli, Mateusz Mazelanik, Micha{\l} Lipka, Alexander Streltsov, Micha{\l} Parniak, Rafal Demkowicz-Dobrzanski
Abstract summary: Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
Score: 55.41644538483948
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator responsible for phase encoding in interferometric experiments. We highlight an apparently counter-intuitive behavior that the asymmetry may \emph{increase} as a result of a \emph{decrease} of coherence inside a degenerate subspace. We intuitively explain and illustrate the phenomena by performing a three-mode single-photon interferometric experiment, where one arm carries the signal and two noisy reference arms have fluctuating phases. We show that the source of the observed sensitivity improvement is the reduction of correlations between these fluctuations and comment on the impact of the effect when moving from the single-photon quantum level to the classical regime. Finally, we also establish the analogy of the effect in the case of entanglement resource theory.

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