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Q: Fachverband Quantenoptik und Photonik
Q 61: Quantum Optics with Photons II
Q 61.2: Talk
Friday, March 10, 2023, 11:30–11:45, E001
Unfolding the Hong-Ou-Mandel interference between narrowband heralded states — •Kaisa Laiho1, Thomas Dirmeier2,3, Golnoush Shafiee2,3, and Christoph Marquardt2,3 — 1German Aerospace Center (DLR), Institute of Quantum Technologies, Wilhelm-Runge-Str. 10, 89081 Ulm — 2Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen — 3Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Physics, Staudtstr. 7/B2, 91058 Erlangen
The Hong-Ou-Mandel (HOM) interference is pivotal for many quantum information and communication applications. In order to drive such quantum optics hardware often spectrally narrowband photonic emitters are required. Lately, parametric down-conversion (PDC) that produces photons in pairs have become a versatile source of twin beams in order to reliably generate heralded states for these purposes.
At high count rates the PDC process produces multiphoton contributions, which are often disregarded in experiments leading to falsified interpretations. Here, we derive the temporal characteristics of the HOM interference between two independent narrowband heralded states emitted via PDC. We consider the effect of the PDC multiphoton contributions and other experimental imperfections such as optical losses and an unbalanced beam splitter ratio. We find out that the multiphoton background can significantly diminish the visibility of the HOM interference dip. Further, the signal-idler cross-correlation turns into a useful figure of merit for the calibration of the photon flux. Our results are important for reaching a high visibility in an experiment.