Coherent backscattering of entangled photon pairs

Mamoon Safadi, Ohad Lib, Ho Chun Lin, Chia Wei Hsu, Arthur Goetschy, Yaron Bromberg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Correlations between entangled photons are a key ingredient for testing fundamental aspects of quantum mechanics and an invaluable resource for quantum technologies. However, scattering from a dynamic medium typically scrambles and averages out such correlations. Here we show that multiply scattered entangled photons reflected from a dynamic complex medium remain partially correlated. In experiments and full-wave simulations we observe enhanced correlations, within an angular range determined by the transport mean free path, which prevail over disorder averaging. Theoretical analysis reveals that this enhancement arises from the interference between scattering trajectories, in which the photons leave the sample and are then virtually reinjected back into it. These paths are the quantum counterpart of the paths that lead to the coherent backscattering of classical light. This work points to opportunities for entanglement transport despite dynamic multiple scattering in complex systems.

Original languageAmerican English
Pages (from-to)562-568
Number of pages7
JournalNature Physics
Volume19
Issue number4
DOIs
StatePublished - Apr 2023

Bibliographical note

Funding Information:
Funding: Zuckerman STEM Leadership Program, the Israel Science Foundation (grant no. 2497/21), National Science Foundation (ECCS-2146021), LABEX WIFI (Laboratory of Excellence within the French Program ‘Investments for the Future’) under references ANR-10-LABX-24 and ANR-10-IDEX-0001-02 PSL*.

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer Nature Limited.

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