Time-Bin Properties of Photon Pairs from a 2GHz Waveguide Resonator

Stefan Kazmaier; Kaisa Laiho

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arXiv · 2610.09545

Time-Bin Properties of Photon Pairs from a 2GHz Waveguide Resonator

Stefan Kazmaier·Kaisa Laiho

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Abstract

We produce degenerate photon pairs called signal and idler via parametric down-conversion (PDC) in a Fabry-Pérot waveguide resonator having close to a 2GHz bandwidth in the telecom C-band. Our PDC source is based on a type-II periodically-poled Lithium Niobate waveguide with high-reflecting end facets forming the resonator. We measure the strength of the photon-pair correlation between signal and idler after selecting a single resonator mode from the multimode PDC emission. Thereafter, we investigate their sub-nanosecond long pulse shapes, in other words the time bins, with standard photon counting. We find that the time-bin durations vary significantly from each other, which can be predicted by the different optical losses of the cross-polarized signal and idler. Further, we simulate the temporal properties of signal and idler via the Fourier transform of their joint spectral characteristics. Our results deliver empiric insight about the time bins of photon pairs and are relevant for driving future quantum networks at the edge to narrow bandwidths but nevertheless in the pulsed regime.

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Stefan Kazmaier, Kaisa Laiho. 2026-10-07. Time-Bin Properties of Photon Pairs from a 2GHz Waveguide Resonator. https://arxiv.org/abs/2610.09545

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