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Pré-Publication, Document De Travail Année : 2023

Classification of quantum states of light using random measurements through a multimode fiber

Luca Innocenti
  • Fonction : Auteur
Alessandro Ferraro
  • Fonction : Auteur
Mauro Paternostro
  • Fonction : Auteur

Résumé

Extracting meaningful information about unknown quantum states without performing a full tomography is an important task. Low-dimensional projections and random measurements can provide such insight but typically require careful crafting. In this paper, we present an optical scheme based on sending unknown input states through a multimode fiber and performing two-point intensity and coincidence measurements. A short multimode fiber implements effectively a random projection in the spatial domain, while a long-dispersive multimode fiber performs a spatial and spectral projection. We experimentally show that useful properties -- i.e., the purity, dimensionality, and degree of indistinguishability -- of various states of light including spectrally entangled biphoton states, can be obtained by measuring statistical properties of photocurrents and their correlation between two outputs over many realizations of unknown random projections. Moreover, we show that this information can then be used for state classification.

Dates et versions

hal-04273875 , version 1 (07-11-2023)

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Citer

Saroch Leedumrongwatthanakun, Luca Innocenti, Alessandro Ferraro, Mauro Paternostro, Sylvain Gigan. Classification of quantum states of light using random measurements through a multimode fiber. 2023. ⟨hal-04273875⟩
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