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Related Experiment Video

Updated: Jan 8, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Programmable nonlinear quantum photonic circuits.

Kasper H Nielsen¹, Ying Wang², Edward C R Deacon³

¹Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.

Nature Communications

|December 11, 2025

Summary

This summary is machine-generated.

Researchers developed programmable nonlinear photonic circuits for quantum technologies. These circuits enable precise single-photon interactions, overcoming a key obstacle in quantum optical circuits and paving the way for advanced quantum simulations.

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Area of Science:

Quantum optics
Nanophotonics
Quantum information science

Background:

Direct photon-photon interactions are essential for nonlinear operations in quantum optical circuits.
The absence of such interactions is a major limitation in developing advanced photonic quantum technologies.

Purpose of the Study:

To demonstrate multi-mode nonlinear photonic circuits capable of programmed linear and nonlinear operations at the single-photon level.
To overcome the limitations of current photonic quantum technologies by enabling precise control over photon interactions.

Main Methods:

Utilizing a tunable quantum dot embedded within a nanophotonic waveguide.
Implementing a temporal linear optical interferometer to mediate photon-photon interactions.
Developing reprogrammable nonlinear photonic circuits for high-precision control.

Main Results:

Successfully demonstrated multi-mode nonlinear photonic circuits with programmable functionalities.
Achieved precise control over linear and nonlinear operations at the single-photon level.
Showcased the ability to reprogram circuits for specific quantum protocols.

Conclusions:

The developed technology enables direct nonlinear operations at the single-photon level in photonic circuits.
This breakthrough facilitates quantum simulation of complex systems, such as anharmonic molecular dynamics.
The reprogrammable nonlinear photonic circuits represent a significant advancement for photonic quantum technologies.