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Entanglement between a Telecom Photon and an On-Demand Multimode Solid-State Quantum Memory.

Jelena V Rakonjac1, Dario Lago-Rivera1, Alessandro Seri1

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.

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Summary
This summary is machine-generated.

Researchers demonstrate entanglement between telecom photons and a solid-state quantum memory. This breakthrough advances long-distance quantum communication by enabling on-demand entanglement storage and retrieval.

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Area of Science:

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

Background:

  • Long-distance quantum communication relies on entanglement between photons and quantum memories.
  • Quantum memories with on-demand readout and multimode capabilities are crucial for improving communication rates.
  • Previous research has focused on various quantum memory systems, but integrating telecom photons with solid-state memories remains a challenge.

Purpose of the Study:

  • To demonstrate entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory.
  • To achieve on-demand readout and long storage times for entangled photons.
  • To assess the feasibility of using this system for future quantum networks.

Main Methods:

  • Photon pairs were generated via nondegenerate parametric down-conversion, creating energy-time entanglement between a telecom idler and a visible signal photon.
  • The visible signal photon was stored in a Pr^{3+}:Y_{2}SiO_{5} crystal using the atomic frequency comb scheme.
  • Entanglement was analyzed using the Franson scheme after recalling the stored photon.

Main Results:

  • The study reports the first demonstration of entanglement between a telecom photon and a multimode solid-state quantum memory.
  • Conditional fidelities of 92(2)% for excited-state storage and 77(2)% for spin-wave storage were measured, sufficient to violate a Bell inequality.
  • Entanglement was stored for up to 47.7 microseconds, enabling potential entanglement distribution over 10 km.

Conclusions:

  • This work establishes a critical link between telecom photons and solid-state quantum memories.
  • The demonstrated on-demand readout and long storage times pave the way for practical quantum repeaters.
  • The findings represent a significant step towards building a robust quantum internet.