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Updated: Mar 22, 2026

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Broadband Spectral Manipulation of Single Photons Using Cross-Phase Modulation.

Kate L Fenwick1, Frédéric Bouchard1, Guillaume Thekkadath1

  • 1National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada.

Physical Review Letters
|March 20, 2026
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Summary
This summary is machine-generated.

Researchers demonstrate precise control over single photon frequency and bandwidth using fiber optics. This breakthrough advances quantum networking and quantum information processing applications.

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Related Experiment Videos

Last Updated: Mar 22, 2026

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Area of Science:

  • Quantum optics
  • Photonics
  • Quantum information science

Background:

  • Precise manipulation of light's frequency and bandwidth is vital for classical and quantum technologies.
  • Applications span communication, spectroscopy, imaging, signal processing, and quantum networking.

Purpose of the Study:

  • To experimentally demonstrate deterministic, broadband frequency control of single photons.
  • To explore the potential for interfacing disparate quantum systems.

Main Methods:

  • Utilized cross-phase modulation in a short single-mode fiber.
  • Employed an intense, ultrafast pump pulse to induce a tunable phase shift on single photons.
  • Measured spectral properties using a time-of-flight spectrometer and superconducting nanowire detectors.

Main Results:

  • Achieved absolute frequency shifts up to ±6.42 THz.
  • Demonstrated bandwidth manipulation by factors ranging from 0.76 to 7.1.
  • Confirmed deterministic and broadband control of heralded telecom-band single photons.

Conclusions:

  • The developed scheme provides a compact and scalable method for spectral routing and bandwidth engineering.
  • This technique is crucial for advancing ultrafast quantum networking and quantum information processing.