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Two-photon dynamics in coherent Rydberg atomic ensemble.

Bing He1, A V Sharypov2, Jiteng Sheng3

  • 1Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2 N 1N4, Canada and Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.

Physical Review Letters
|April 22, 2014
PubMed
Summary
This summary is machine-generated.

We investigated photon-photon interactions in Rydberg atoms for quantum applications. Weak interactions, not strong blockade, enable ideal cross-phase modulation for quantum information processing.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • Rydberg atoms enable strong interactions between atoms and light.
  • Electromagnetically induced transparency (EIT) creates a transparent medium for light in an atomic ensemble.
  • Controlling photon-photon interactions is crucial for quantum computing and communication.

Purpose of the Study:

  • To investigate two-photon interactions in a Rydberg atomic ensemble under EIT conditions.
  • To determine the optimal conditions for implementing photon-photon cross-phase modulation (XPM).
  • To assess the suitability of the blockade regime for XPM.

Main Methods:

  • Combined semiclassical approach for pulse propagation.
  • Complete quantum treatment for quantum state evolution.
  • Utilized electromagnetically induced transparency in a Rydberg atomic ensemble.

Main Results:

  • The blockade regime is unsuitable for photon-photon XPM due to pulse absorption and dispersion.
  • Approximately ideal XPM can be achieved with relatively weak interactions.
  • Counterpropagating and transversely separated pulses are effective for realizing XPM.

Conclusions:

  • Photon-photon XPM in Rydberg ensembles is feasible, but not in the strong blockade regime.
  • Weak interactions offer a promising route for implementing high-fidelity XPM.
  • The findings provide guidance for designing quantum optical devices for quantum information processing.