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Updated: Jul 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum walk comb in a fast gain laser.

Ina Heckelmann1, Mathieu Bertrand1, Alexander Dikopoltsev1

  • 1Institute of Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland, and Quantum Center, ETH Zürich, 8093 Zürich, Switzerland.

Science (New York, N.Y.)
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Researchers demonstrate a novel quantum walk comb in synthetic frequency space using a modulated semiconductor laser. This approach avoids state dissipation and generates a stable, broadband frequency comb, offering a new platform for tunable light generation.

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Area of Science:

  • Photonics
  • Quantum simulation
  • Laser physics

Background:

  • Synthetic lattices in photonics allow exploration of light states beyond physical space.
  • Quantum walks are a powerful tool for simulating quantum systems.

Purpose of the Study:

  • To propose and demonstrate a quantum walk comb in synthetic frequency space.
  • To utilize ultrafast recovery time ring-shaped semiconductor lasers for this purpose.

Main Methods:

  • Externally modulating a ring-shaped semiconductor laser with ultrafast recovery times.
  • Implementing a quantum walk in synthetic frequency space.
  • Analyzing the stability and spectral properties of the generated light state.

Main Results:

  • The quantum walk did not dissipate into low supermode states.
  • The state stabilized into a broad frequency comb.
  • A low-noise, nearly flat broadband comb with 100 cm⁻¹ bandwidth was produced.

Conclusions:

  • The developed device unlocks the potential of synthetic frequency lattices.
  • It offers a promising platform for generating broadband, tunable, and stable frequency combs.