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Related Experiment Video

Updated: Jul 15, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Integrated unidirectional traveling-wave phonon waveguide parametric amplifier.

Liang Zhang^1,2, Chaohan Cui², Yongzhou Xue²

¹Chandra Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USA.

Nature Communications

|July 13, 2026

Summary

Researchers developed the first integrated unidirectional traveling-wave phonon parametric amplifier. This breakthrough in phononic integrated circuits (PnICs) enables advanced signal processing for future quantum and classical devices.

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Area of Science:

Quantum physics
Materials science
Nanotechnology

Background:

Phonons, the quanta of elastic waves, are crucial in classical and quantum applications.
Advancements in nanofabrication have led to phononic integrated circuits (PnICs) for nanoscale phonon control.
Phonon amplifiers are vital for PnICs, but traveling-wave integrated versions were previously unrealized.

Purpose of the Study:

To demonstrate the first integrated unidirectional traveling-wave phonon parametric amplifier.
To explore photon-phonon interactions in a hybrid integrated platform for advanced signal processing.

Main Methods:

Utilized Brillouin scattering (Stokes and Anti-Stokes processes) in a gallium nitride photonic-phononic hybrid integrated platform.
Engineered a system with strong confinement and low propagation losses for optical and acoustic fields.
Achieved robust photon-phonon interactions over extended spatial and temporal scales.

Main Results:

Demonstrated unidirectional traveling-wave phonon parametric amplification.
Achieved 5.8 dB phonon gain with 50-mW on-chip pump power (net gain -1.8 dB including propagation loss).
Observed over 10 dB non-reciprocity between forward and backward directions, realizing the first integrated unidirectional traveling-wave phonon parametric amplifier.

Conclusions:

This work represents a significant advancement in integrated phononics.
The developed device offers new opportunities for phononic-related information processing.
The realization of an integrated unidirectional traveling-wave phonon parametric amplifier paves the way for novel device applications.