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Updated: Nov 24, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

High-extinction CROW filters for scalable quantum photonics.

Rakesh Ranjan Kumar, Hon Ki Tsang

|December 28, 2020

Summary

We developed a compact silicon optical filter that achieves over 96 dB rejection, crucial for filtering pump photons in quantum photon generation via spontaneous four-wave mixing (SFWM). This tunable filter enhances quantum photonics applications.

Area of Science:

Photonics and Optical Engineering
Quantum Information Science
Integrated Optics

Background:

Spontaneous four-wave mixing (SFWM) is a key process for generating quantum-correlated photon pairs.
Efficiently filtering out strong pump photons is essential for isolating the generated photon pairs in SFWM experiments.
Existing filtering methods often lack the high extinction ratios or compactness required for integrated quantum photonic circuits.

Purpose of the Study:

To report a novel integrated tunable-bandwidth optical filter with a high passband to stop-band ratio.
To demonstrate the filter's application in suppressing pump photons during non-degenerate spontaneous four-wave mixing.
To explore the potential of this filter for advancing integrated quantum photonic technologies.

Main Methods:

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Last Updated: Nov 24, 2025

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Fabrication of an ultra-compact optical filter on a single silicon chip.
Utilizing two cascaded second-order coupled-resonator optical waveguide (CROW) filters.
Integration of the CROW filters with a long silicon waveguide for SFWM experiments.

Main Results:

Achieved an unprecedented passband to stop-band ratio exceeding 96 dB.
Successfully filtered out pump photons in a non-degenerate SFWM process.
Demonstrated tunable bandwidth, allowing adjustment of quantum correlated photon coherence time.

Conclusions:

The developed integrated optical filter offers a highly effective solution for pump-rejection in SFWM.
The filter's tunable bandwidth provides control over photon coherence, beneficial for quantum applications.
This technology holds significant promise for the development of large-scale integrated quantum photonic circuits.