Quantum Asymmetry and Noisy Multimode Interferometry,Physical Review Letters

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Quantum Asymmetry and Noisy Multimode Interferometry
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-06-17 , DOI: 10.1103/physrevlett.128.240504
Francesco Albarelli _{1,

2} , Mateusz Mazelanik _{1,

3} , Michał Lipka ₃ , Alexander Streltsov ₃ , Michał Parniak _{3,

4} , Rafał Demkowicz-Dobrzański ₁

Affiliation

Quantum asymmetry is a physical resource that coincides with the amount of coherence between the eigenspaces of a generator responsible for phase encoding in interferometric experiments. We highlight an apparently counterintuitive behavior that the asymmetry may increase as a result of a 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.

中文翻译：

量子不对称和噪声多模干涉

量子不对称是一种物理资源，与干涉实验中负责相位编码的发生器的本征空间之间的相干量相一致。我们强调了一种明显违反直觉的行为，即不对称性可能会因减少而增加退化子空间内的相干性。我们通过执行三模单光子干涉实验来直观地解释和说明这一现象，其中一个臂承载信号，两个噪声参考臂具有波动的相位。我们表明，观察到的灵敏度提高的来源是这些波动之间相关性的降低，并评论了从单光子量子能级转移到经典状态时效应的影响。最后，我们还在纠缠资源理论的情况下建立了效果的类比。

更新日期：2022-06-17

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