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Efficient quantum memory for light.

Morgan P Hedges1, Jevon J Longdell, Yongmin Li

  • 1Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia. mph111@physics.anu.edu.au

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|June 26, 2010
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Researchers developed a highly efficient solid-state quantum memory for light, surpassing classical limits. This breakthrough enables secure quantum information processing and communication by faithfully storing and retrieving quantum states.

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Area of Science:

  • Quantum information science
  • Quantum optics
  • Solid-state physics

Background:

  • Storing quantum states of light is crucial for quantum information processing.
  • Classical methods destroy quantum information due to the Heisenberg uncertainty principle.
  • Existing quantum memories in atomic vapors have low efficiency (<17%) and limited photon numbers.

Purpose of the Study:

  • To develop a low-noise, highly efficient quantum memory for light.
  • To enable on-demand storage and retrieval of quantum states without information corruption.
  • To surpass the performance of classical memory and existing quantum memory technologies.

Main Methods:

  • Utilized a novel solid-state medium for quantum state storage.
  • Demonstrated storage and retrieval of weak coherent states (single-photon level) and bright states (up to 500 photons).
  • Quantified memory efficiency and fidelity, comparing performance against classical limits and the no-cloning theorem.

Main Results:

  • Achieved high efficiency up to 69% with a solid-state quantum memory.
  • Demonstrated faithful storage and retrieval of quantum states across a wide range of photon numbers.
  • Exceeded the no-cloning limit for input coherent states with 30 photons or fewer.

Conclusions:

  • The developed solid-state quantum memory offers superior performance compared to previous technologies.
  • This advancement is critical for practical quantum communication and information processing applications.
  • The memory's ability to retrieve more information than is destroyed ensures enhanced security.