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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Programmable on-chip nonlinear photonics.

Ryotatsu Yanagimoto1,2, Benjamin A Ash3, Mandar M Sohoni3

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA. ryotatsu.yanagimoto@ntt-research.com.

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|October 8, 2025
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Summary
This summary is machine-generated.

Researchers developed a reconfigurable nonlinear optical device. This programmable photonic chip allows for dynamic control of light, overcoming fixed-function limitations in quantum and classical technologies.

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Area of Science:

  • Photonics and nonlinear optics
  • Quantum and classical technologies
  • Materials science

Background:

  • Nonlinear optical devices are crucial for photonic technologies but typically have fixed functionality after fabrication.
  • This inflexibility limits their application in dynamic scenarios.
  • Existing devices lack reconfigurability, hindering advancements in adaptive optical systems.

Purpose of the Study:

  • To present a novel photonic device with programmable nonlinear optical functionality.
  • To demonstrate arbitrary reconfigurable two-dimensional nonlinear distributions.
  • To overcome the limitations of fixed-function nonlinear optical devices.

Main Methods:

  • Utilized electric-field-induced second-order nonlinear susceptibility (χ(2)) in an optical slab waveguide.
  • Engineered programmability via massively parallel control of electric fields using a photoconductive layer and optical programming.
  • Demonstrated spectral, spatial, and spatio-spectral engineering of second-harmonic generation (SHG).

Main Results:

  • Achieved an arbitrarily reconfigurable two-dimensional distribution of χ(2) nonlinearity.
  • Demonstrated in-situ inverse design of quasi-phase-matching grating structures.
  • Showcased real-time feedback for compensating operational and environmental fluctuations.

Conclusions:

  • The developed device breaks the conventional one-device-one-function paradigm in nonlinear optics.
  • Programmable nonlinear optics enables applications requiring fast device reconfigurability.
  • Potential applications include programmable quantum gates, adaptive optical signal processing, and advanced sensing.