Preprint

PUBDB-2025-01534

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quadrature squeezing in a nanophotonic microresonator

Ulanov, A. (Corresponding author)CFEL*DESY* ; Ruhnke, B.CFEL*Extern*DESY* ; Wildi, T.CFEL*DESY* ; Herr, T. (Corresponding author)CFEL*DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-01534

Report No.: arXiv:2502.17337

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.

Note: 9 pages, 3 figures

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Contributing Institute(s):

1. FS-CFEL-2-UMP (FS-CFEL-2-UMP)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. STARCHIP - Microphotonics-based frequency combs for habitable exoplanet detection (853564) (853564)
3. M-Engine - Microcomb Photonic Engine (101137000) (101137000)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2025

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