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Long-lived quantum memory with nuclear atomic spins.

A Dantan1, G Reinaudi, A Sinatra

  • 1LKB, UPMC, case 74, place Jussieu, 75252 Paris Cedex 05, France.

Physical Review Letters
|October 4, 2005
PubMed
Summary

We propose storing quantum light states into a large nuclear spin ensemble of helium-3 atoms. This method uses metastability exchange collisions for quantum correlation transfer, enabling long-term storage of nonclassical light states.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Condensed matter physics

Background:

  • Nonclassical states of light, such as squeezed vacuum states, are crucial for quantum information processing.
  • Storing these states for extended periods is a significant experimental challenge.

Purpose of the Study:

  • To propose a novel method for storing nonclassical states of light into a macroscopic nuclear spin ensemble.
  • To explore the use of metastability exchange collisions for quantum state transfer and storage.

Main Methods:

  • Utilizing metastability exchange collisions in a 3He vapor to transfer quantum correlations.
  • Mapping a squeezed vacuum field state onto the collective nuclear spin of approximately 10^18 atoms.

Main Results:

Related Experiment Videos

  • Demonstrated the theoretical possibility of transferring quantum correlations via metastability exchange collisions.
  • Proposed a scheme for long-term storage (hours) of nonclassical light states in a 3He nuclear spin ensemble.

Conclusions:

  • Metastability exchange collisions offer a viable mechanism for mapping quantum states of light onto nuclear spins.
  • This approach provides a promising avenue for developing robust quantum memories.