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Quantum interference of electromagnetic fields from remote quantum memories.

T Chanelière1, D N Matsukevich, S D Jenkins

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.

Physical Review Letters
|May 16, 2007
PubMed
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Researchers observed quantum interference between two remote atomic memories, a key step for scalable entanglement distribution. This was achieved using finite atomic memory time in four-photon coincidence measurements.

Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • Quantum interference is fundamental to quantum information processing.
  • Entanglement distribution over long distances is essential for quantum networks.
  • Atomic memories are being developed for quantum information storage and retrieval.

Purpose of the Study:

  • To demonstrate quantum interference between fields from two remote atomic memories.
  • To investigate the role of finite atomic memory time in achieving high-visibility interference.
  • To establish a foundational element for scalable entanglement distribution protocols.

Main Methods:

  • Utilizing two remote atomic memories to generate quantum fields.
  • Performing four-photon delayed coincidence measurements.

Related Experiment Videos

  • Leveraging the finite atomic memory time to enhance interference visibility.

    • Main Results:

    • Observation of quantum Hong-Ou-Mandel interference between the remote atomic memories.
    • Achieved high-visibility interference by controlling atomic memory time.
    • Demonstrated the feasibility of interference for remote quantum field interactions.

    Conclusions:

    • Quantum interference between remote atomic memories is achievable.
    • Finite atomic memory time is a critical parameter for high-visibility quantum interference.
    • This work is a crucial step towards scalable entanglement distribution for quantum networks.