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Low-light-level cross-phase-modulation based on stored light pulses.

Yong-Fan Chen1, Chang-Yi Wang, Shih-Hao Wang

  • 1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300, Republic of China.

Physical Review Letters
|February 21, 2006
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Summary
This summary is machine-generated.

Researchers demonstrated a low-light cross-phase-modulation (XPM) scheme using light storage in cold atoms. This method achieves significant phase shifts, offering enhanced experimental flexibility for quantum information processing.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Quantum Information Science

Background:

  • Cross-phase-modulation (XPM) is crucial for quantum information processing.
  • Traditional XPM schemes often require high light intensities or specific atomic properties.
  • Light-storage techniques offer novel ways to control light-matter interactions.

Purpose of the Study:

  • To experimentally demonstrate a low-light-level XPM scheme using light storage in laser-cooled Rubidium-87 atoms.
  • To compare the performance of this scheme with static electromagnetically induced transparency (EIT).
  • To investigate the influence of coupling intensity and atomic optical density on the phase shift and energy loss.

Main Methods:

  • Utilizing laser-cooled Rubidium-87 atoms as the medium.
  • Implementing a light-storage technique to control light-matter interactions.
  • Employing a cross-phase-modulation (XPM) scheme with a probe and signal pulse.

Main Results:

  • Achieved a significant phase shift comparable to static EIT.
  • Demonstrated that phase shift and energy loss are independent of coupling intensity and atomic optical density.
  • Obtained conditional phase shifts on the order of pi with single photons.

Conclusions:

  • The light-storage XPM scheme provides enhanced experimental flexibility.
  • This technique enables precise control over quantum optical phenomena at low light levels.
  • The scheme is promising for scalable quantum information processing and quantum computing applications.