Time Entanglement between a Photon and a Spin Wave in a Multimode Solid-State Quantum Memory

Kutlu Kutluer, Emanuele Distante, Bernardo Casabone, Stefano Duranti, Margherita Mazzera, Hugues de Riedmatten

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Abstract

The generation and distribution of entanglement are key resources in quantum repeater schemes. Temporally multiplexed systems offer time-bin encoding of quantum information which provides robustness against decoherence in fibers, crucial in long distance communication. Here, we demonstrate the direct generation of entanglement in time between a photon and a collective spin excitation in a rare earth ion doped ensemble. We analyze the entanglement by mapping the atomic excitation onto a photonic qubit and by using time-bin qubit analyzers implemented with another doped crystal using the atomic frequency comb technique. Our results provide a solid-state source of entangled photons with embedded quantum memory. Moreover, the quality of the entanglement is high enough to enable a violation of a Bell inequality by more than two standard deviations.

Original languageEnglish
Article number030501
JournalPhysical Review Letters
Volume123
Issue number3
Early online date15 Jul 2019
DOIs
Publication statusPublished - 19 Jul 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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