Quadrature squeezing in a nanophotonic microresonator

Alexander E. Ulanov (), Bastian Ruhnke, Thibault Wildi and Tobias Herr ()
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Alexander E. Ulanov: Deutsches Elektronen-Synchrotron DESY
Bastian Ruhnke: Deutsches Elektronen-Synchrotron DESY
Thibault Wildi: Deutsches Elektronen-Synchrotron DESY
Tobias Herr: Deutsches Elektronen-Synchrotron DESY

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Squeezed states of light are essential for emerging quantum technology in metrology and information processing. Chip-integrated photonics offers a route to scalable and efficient squeezed light generation, however, parasitic nonlinear processes and optical losses remain significant challenges. Here, we demonstrate single-mode quadrature squeezing in a photonic crystal microresonator via degenerate dual-pump spontaneous four-wave mixing. Implemented in a scalable, low-loss silicon-nitride photonic-chip platform, the microresonator features a tailored nano-corrugation that modifies its resonances to suppress parasitic nonlinear processes. In this way, we achieve an estimated 7.8 dB of on-chip squeezing in the bus waveguide, with potential for further improvement. These results open a promising pathway toward integrated squeezed light sources for quantum-enhanced interferometry, Gaussian boson sampling, coherent Ising machines, and universal quantum computing.

Date: 2025
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DOI: 10.1038/s41467-025-66703-x

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