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Generation of Light with Multimode Time-Delayed Entanglement Using Storage in a Solid-State Spin-Wave Quantum Memory.

Kate R Ferguson1, Sarah E Beavan2, Jevon J Longdell3

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Researchers generated and stored quantum entanglement in a solid-state spin-wave quantum memory using rephased amplified spontaneous emission (RASE). This breakthrough enables on-demand readout and paves the way for scalable quantum networks.

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Area of Science:

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

Background:

  • Quantum entanglement is a key resource for quantum information processing.
  • Solid-state quantum memories are crucial for building robust quantum networks.
  • Previous methods faced challenges in generating and storing entanglement efficiently.

Purpose of the Study:

  • To demonstrate the generation and storage of entanglement in a solid-state spin-wave quantum memory.
  • To utilize rephased amplified spontaneous emission (RASE) for on-demand quantum memory readout.
  • To investigate the temporal multimode properties of RASE for quantum networking applications.

Main Methods:

  • Generating entanglement via amplified spontaneous emission (ASE) from a Pr^{3+}:Y_{2}SiO_{5} crystal ensemble.
  • Storing the entangled state as a spin wave for up to 5 microseconds.
  • Employing a four-level photon echo technique for rephasing and on-demand readout.
  • Analyzing the temporal modes and distinguishability of the RASE signal.

Main Results:

  • Successfully generated and stored entanglement in a solid-state spin-wave quantum memory.
  • Confirmed entanglement between the ASE and its echo, preserving inseparability violation during storage.
  • Demonstrated that RASE is temporally multimode with high distinguishability between temporal modes.
  • Achieved on-demand readout of the stored entangled state.

Conclusions:

  • RASE is a viable technique for generating and storing entanglement in solid-state quantum memories.
  • The temporal multimode nature of RASE is beneficial for scalable quantum networks.
  • This work advances the development of robust and efficient quantum memory solutions for future quantum communication systems.