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Related Experiment Video

Updated: Sep 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum Valley Hall Effect-Based Coupler with Continuously Tunable Transmission for Topological Information

Keita Funayama¹, Kenichi Yatsugi¹, Hiroya Tanaka¹

¹Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480-1192, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 30, 2025

Summary

Researchers developed a tunable topological coupler for robust signal transfer. This breakthrough enables continuously adjustable transmission coefficients, advancing topological integrated circuits and communication systems.

Keywords:

digital data transfer elastic waveguide micro electromechanical systems topological insulator tunable coupler

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Area of Science:

Condensed matter physics
Photonics
Wave systems

Background:

Topological insulators offer robust, unidirectional wave propagation.
Tunable couplers are crucial for topological integrated circuits.
Existing topological couplers lack continuously tunable transmission.

Purpose of the Study:

To experimentally demonstrate a continuously tunable topological coupler.
To show topological data transfer capabilities using the coupler.

Main Methods:

Utilized quantum valley Hall effect-based waveguides in a four-port coupler.
Investigated transmission coefficients within the bandgap.
Demonstrated digital signal transfer using frequency shift keying modulation.

Main Results:

Achieved continuously tunable transmission coefficients from one input to two output ports.
Maintained topological protection, isolating the remaining port.
Demonstrated high-fidelity digital signal transfer, approaching theoretical limits.

Conclusions:

The developed coupler offers unprecedented tunability in topological wave systems.
This work enables practical applications in topological data transfer and signal processing.
Paves the way for advanced topological integrated circuits.