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Transporting Long-Lived Quantum Spin Coherence in a Photonic Crystal Fiber.

Mingjie Xin1, Wui Seng Leong1, Zilong Chen1

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|May 11, 2019
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Summary

We demonstrate coherent guiding of rubidium-85 atoms in a hollow-core photonic crystal fiber, maintaining quantum spin coherence over centimeters. This advances quantum information networks and quantum sensing.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Materials science

Background:

  • Hollow-core photonic crystal fibers enable particle-light interactions over extended distances.
  • Maintaining quantum spin coherence and transport in waveguides is a significant challenge.

Purpose of the Study:

  • To demonstrate coherent guiding of ground-state superpositions of rubidium-85 atoms in a hollow-core photonic crystal fiber.
  • To investigate the factors limiting quantum spin coherence over macroscopic distances.

Main Methods:

  • Utilizing a hollow-core photonic crystal fiber to guide atoms.
  • Preparing and manipulating ground-state superpositions of rubidium-85 atoms.
  • Measuring coherence times and guiding distances.

Main Results:

  • Coherent guiding of rubidium-85 atoms over a centimeter range was achieved.
  • Quantum spin coherence was maintained for hundreds of milliseconds.
  • Decoherence was primarily attributed to light shifts and magnetic field inhomogeneity.

Conclusions:

  • This work establishes a centimeter-scale platform for coherent atom guiding in hollow-core photonic crystal fibers.
  • The findings are crucial for developing quantum information networks and matter-wave circuits for quantum sensing.