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Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network.

Rikizo Ikuta1, Toshiki Kobayashi2, Tetsuo Kawakami2

  • 1Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan. ikuta@mp.es.osaka-u.ac.jp.

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Solid-state quantum frequency conversion enables telecom photons to interface with atomic quantum storages. This breakthrough is crucial for long-distance quantum communication networks.

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Area of Science:

  • Quantum communication
  • Quantum information science
  • Atomic physics

Background:

  • Long-distance quantum communication relies on quantum storages compatible with telecom photons.
  • Atomic quantum storages offer long storage times but lack direct telecom photon interfacing.
  • A wavelength mismatch exists between telecom photons and atomic ensembles.

Purpose of the Study:

  • To demonstrate a polarization-insensitive solid-state quantum frequency conversion.
  • To bridge the wavelength gap between short-wavelength photons entangled with atomic ensembles and the telecom range.
  • To enable interfacing atomic quantum storages with telecom photonic infrastructure.

Main Methods:

  • Generated atom-photon entanglement using a Rubidium (Rb) atomic ensemble.
  • Employed a nonlinear-crystal-based frequency converter within a Sagnac interferometer.
  • Translated the wavelength of entangled photons to the telecom range.

Main Results:

  • Successfully demonstrated polarization-insensitive quantum frequency conversion.
  • Maintained entanglement between the photon and the atomic ensemble after wavelength conversion.
  • Achieved conversion of short-wavelength photons to the telecom range.

Conclusions:

  • Solid-state quantum frequency conversion is a viable method to interface atomic quantum storages with telecom photons.
  • This technique overcomes a critical obstacle for realizing long-distance quantum communication.
  • The demonstrated method preserves quantum entanglement during wavelength translation.