Quantum interference and entanglement induced by multiple scattering of light

TL;DR

This paper explores how multiple scattering of light can induce quantum interference and entanglement, revealing potential applications in quantum information processing through enhanced photon correlations and continuous variable entanglement.

Contribution

It demonstrates that quantum interference effects persist in multiple scattering media and can generate entanglement, advancing understanding of quantum light behavior in complex environments.

Findings

Quantum interference survives averaging over disorder ensembles.

Photon correlations are increased, leading to photon anti-bunching.

Continuous variable entanglement is predicted in speckle patterns.

Abstract

We report on the effects of quantum interference induced by transmission of an arbitrary number of optical quantum states through a multiple scattering medium. We identify the role of quantum interference on the photon correlations and the degree of continuous variable entanglement between two output modes. It is shown that the effect of quantum interference survives averaging over all ensembles of disorder and manifests itself as increased photon correlations giving rise to photon anti-bunching. Finally, the existence of continuous variable entanglement correlations in a volume speckle pattern is predicted. Our results suggest that multiple scattering provides a promising way of coherently interfering many independent quantum states of light of potential use in quantum information processing.