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Reversible state transfer between light and a single trapped atom.

A D Boozer1, A Boca, R Miller

  • 1Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, CA 91125, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Scientists achieved reversible quantum state transfer between light and atoms in an optical cavity. This breakthrough advances quantum networks by enabling coherent information distribution using cavity quantum electrodynamics (QED).

Area of Science:

  • Quantum Optics
  • Atomic Physics
  • Quantum Information Science

Background:

  • Cavity Quantum Electrodynamics (QED) is crucial for quantum information processing.
  • Efficient quantum state transfer between light and matter is essential for quantum networks.

Purpose of the Study:

  • To demonstrate reversible mapping of coherent light states to atomic hyperfine states.
  • To verify the coherence of quantum state transfer processes.
  • To advance the development of cavity QED-based quantum networks.

Main Methods:

  • Trapping an atom within a high-finesse optical cavity.
  • Utilizing coherent light states with a mean photon number of approximately 1.1.
  • Mapping atomic states back to field states to verify phase-dependent coherence.

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Main Results:

  • Successfully demonstrated reversible mapping between coherent light states and atomic hyperfine states.
  • Verified the coherence of the quantum state transfer process through phase-dependent mapping.
  • Achieved a mean photon number of approximately 1.1 for the coherent light state.

Conclusions:

  • The experiment is a significant step towards building quantum networks using cavity QED.
  • Coherent transfer of quantum states is feasible and verifiable.
  • This work facilitates the distribution of quantum information across networks.