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Fabrication of Silica Ultra High Quality Factor Microresonators
Published on: July 2, 2012
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Quadrature squeezing in a nanophotonic microresonator
Alexander E Ulanov1, Bastian Ruhnke2, Thibault Wildi2
1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. alexander.ulanov@desy.de.
Nature Communications
|November 27, 2025
Summary
Researchers developed chip-integrated squeezed light sources using silicon nitride microresonators. This advancement suppresses parasitic nonlinearities, paving the way for scalable quantum technologies in metrology and computing.
Area of Science:
- Quantum optics and photonics
- Integrated photonics and quantum technology
Background:
- Squeezed states of light are crucial for quantum technology applications like metrology and information processing.
- Generating squeezed light efficiently on-chip faces challenges from parasitic nonlinearities and optical losses.
Purpose of the Study:
- To demonstrate single-mode quadrature squeezing in a chip-integrated photonic crystal microresonator.
- To suppress parasitic nonlinear processes that hinder squeezed light generation.
Main Methods:
- Utilized degenerate dual-pump spontaneous four-wave mixing in a silicon nitride photonic chip.
- Engineered a photonic crystal microresonator with tailored nano-corrugation to modify resonances and suppress parasitic nonlinearities.
Main Results:
- Achieved an estimated 7.8 dB of on-chip squeezing in the bus waveguide.
- Demonstrated a scalable, low-loss platform for squeezed light generation.
Conclusions:
- The developed microresonator design effectively suppresses parasitic nonlinearities.
- This work presents a promising pathway for integrated squeezed light sources for various quantum applications, including interferometry, boson sampling, and quantum computing.
