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Coherent Backscattering of Light Off One-Dimensional Atomic Strings.

H L Sørensen1, J-B Béguin1, K W Kluge1

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Researchers achieved coherent Bragg scattering in a 1D atom-photon system using cesium atoms trapped in an optical fiber. This demonstrates enhanced light reflection, paving the way for novel quantum technologies.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Nanophotonics

Background:

  • Coherent Bragg scattering is crucial for light-matter interactions.
  • One-dimensional (1D) atom-photon systems offer unique quantum properties.
  • Achieving strong coupling in 1D systems is a key challenge.

Purpose of the Study:

  • To experimentally realize coherent Bragg scattering in a 1D atom-photon system.
  • To demonstrate enhanced light reflection from a 1D atomic array.
  • To explore the potential for collective strong coupling in such systems.

Main Methods:

  • Trapping cesium atoms in the evanescent field of a tapered optical fiber.
  • Guiding probe light through the same optical fiber.
  • Measuring power reflection from the atomic strings.

Main Results:

  • Achieved the first experimental realization of coherent Bragg scattering in a 1D system.
  • Observed nearly 12% power reflection from approximately 1000 cesium atoms.
  • Demonstrated a two-orders-of-magnitude enhancement in reflection compared to randomly positioned atoms.

Conclusions:

  • The results pave the way for collective strong coupling in 1D atom-photon systems.
  • The approach allows for fiber-connected 1D atomic crystals.
  • This work advances the development of novel quantum devices and technologies.