Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 1: QIP Implementations: Photons I

MON 1.2: Talk

Monday, September 8, 2025, 14:30–14:45, ZHG001

Integrated resonant squeezer for GBS — •Jonas Sichler, Christine Silberhorn, Philip Mues, Werner Ridder, and Simone Atzeni — IQO, Universität Paderborn, Deutschland

Single-spectral-mode single-mode squeezed states are a key resource for Gaussian boson sampling (GBS) and other large-scale photonic networks. We investigate an integrated, resonator-enhanced, type-0 parametric down-conversion source in titanium-indiffused lithium niobate waveguides. By tuning the pump pulse length and tailoring the cavity geometry and mirror reflectivities correlations are suppressed and single-modeness can be achieved. The phase-matching center is set by the periodic poling and custom dielectric coatings define the cavity finesse. Achieving full single-modeness still requires external filtering in order to reject the neighboring cavity modes separated by the GHz-scale free spectral range, a demanding yet tractable task, which can be achieved, for example, with the use of filter cavities. Simulations incorporating realistic fabrication tolerances confirm that this multidimensional optimization delivers the desired joint-spectral amplitude. The resulting chip-scale Ti:LiNbO3 source provides a practical, low-loss building block for deployment in large quantum photonic networks, for example as the workhorse of GBS.

Keywords: Gaussian Boson sampling; Resonator; Parametric down-conversion; Squeezed states