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Related Experiment Video

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Quasi-light Storage for Optical Data Packets
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Experimental demonstration of quantum memory for light.

Brian Julsgaard1, Jacob Sherson, J Ignacio Cirac

  • 1Niels Bohr Institute, Danish Quantum Optics Center-QUANTOP, Copenhagen University, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark.

Nature
|November 27, 2004
PubMed
Summary
This summary is machine-generated.

Researchers developed a quantum memory for light using atomic ensembles. This quantum memory achieves 70% fidelity, surpassing classical recording limits for quantum information storage.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Optics

Background:

  • Light pulses are quantum objects, making perfect classical recording impossible.
  • Transferring quantum light states to atomic memory is a long-standing challenge in quantum information.

Purpose of the Study:

  • To propose and demonstrate a high-fidelity quantum memory for light using atomic ensembles.
  • To overcome classical recording limitations for quantum state transfer.

Main Methods:

  • Utilized spin-polarized caesium atoms for interaction with light pulses.
  • Employed an entangling field and measurement of transmitted light.
  • Implemented conditional radio-frequency magnetic pulse feedback onto atoms.

Main Results:

  • Achieved 70% fidelity in recording quantum states of light onto the atomic memory.
  • Demonstrated a 33% higher density of recorded states compared to classical methods.
  • Established a quantum memory lifetime of up to 4 milliseconds.

Conclusions:

  • The proposed protocol enables high-fidelity quantum storage of light onto atomic ensembles.
  • This advancement significantly exceeds classical recording capabilities for quantum information.
  • The developed quantum memory shows promise for future quantum communication and information processing applications.