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Fiber-optical switch controlled by a single atom.

Danny O'Shea1, Christian Junge, Jürgen Volz

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Summary
This summary is machine-generated.

A single atom controls optical signal switching between fibers using a microresonator. This novel fiber-optical switch achieves over 60% efficiency and demonstrates photon-number-dependent routing capabilities.

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Area of Science:

  • Quantum optics
  • Cavity quantum electrodynamics
  • Nanophotonics

Background:

  • Precise control of optical signals is crucial for quantum information processing.
  • Single-atom-light interactions offer unique quantum control possibilities.
  • Microresonators provide enhanced light-matter interaction for quantum systems.

Purpose of the Study:

  • To demonstrate efficient optical signal switching controlled by a single atom.
  • To investigate the performance of a whispering-gallery-mode bottle microresonator coupled to a single atom for optical switching.
  • To explore the photon-number-dependent routing capabilities of such a system.

Main Methods:

  • Utilizing a whispering-gallery-mode bottle microresonator coupled to a single atom.
  • Interfacing the microresonator with two tapered fiber couplers for optical signal input and output.
  • Operating the system in the strong coupling regime of cavity quantum electrodynamics.
  • Measuring switching efficiency and second-order correlation functions.

Main Results:

  • Achieved highly efficient optical signal switching with over 60% raw fidelity without postselection.
  • Demonstrated vacuum Rabi splitting, indicating strong coupling between the atom and the microresonator.
  • Showcased photon-number-dependent routing capabilities by analyzing output field correlations.

Conclusions:

  • A single atom-controlled fiber-optical switch based on a microresonator is feasible and efficient.
  • The demonstrated system offers a promising platform for quantum information processing and optical signal control.
  • The photon-number-dependent routing capability opens avenues for advanced quantum optical functionalities.