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Related Experiment Video

Updated: Mar 9, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Temporal Multimode Storage of Entangled Photon Pairs.

Alexey Tiranov1, Peter C Strassmann1, Jonathan Lavoie1

  • 1Groupe de Physique Appliquée, Université de Genève, CH-1211 Genève, Switzerland.

Physical Review Letters
|December 24, 2016
PubMed
Summary

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Researchers demonstrate storing and retrieving two entangled photon pairs in a solid-state quantum memory, achieving a ten-mode temporal capacity. This advance in quantum memory technology is crucial for building future quantum networks.

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Solid-State Physics

Background:

  • Quantum networks require robust quantum memories for storing and processing entangled photons.
  • Multiplexing entangled photons is a key challenge for scaling quantum communication systems.

Purpose of the Study:

  • To demonstrate and certify the simultaneous storage and retrieval of multiple entangled photon pairs in a solid-state quantum memory.
  • To measure the temporal multimode capacity of the quantum memory platform.
  • To develop and apply a novel method for certifying entanglement in multiplexed quantum memories.

Main Methods:

  • Utilized polarization-entangled photon pairs generated via spontaneous parametric down-conversion.
  • Employed the atomic frequency comb (AFC) protocol to map photons onto a rare-earth-ion-doped (REID) crystal.

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Last Updated: Mar 9, 2026

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  • Developed and implemented indirect entanglement witnesses (Schmidt number witnesses) for certification.

    • Main Results:

    • Successfully demonstrated simultaneous storage and retrieval of two entangled photon pairs.
    • Measured a temporal multimode capacity of ten modes within the REID-AFC quantum memory.
    • Experimentally certified the presence of more than one entangled pair retrieved from the memory.

    Conclusions:

    • Rare-earth-ion-doped (REID) crystals with the atomic frequency comb (AFC) protocol offer a viable platform for temporal multiplexing of entangled photon pairs.
    • The developed indirect entanglement witness method provides a new tool for characterizing multiplexed quantum memories.
    • This work advances the development of scalable quantum networks through improved quantum memory capabilities.