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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.39: Poster

Dienstag, 12. März 2024, 17:00–19:00, Tent B

Hong-Ou-Mandel interference in the spectral domain — •Patrick Folge, Abhinandan Bhattacharjee, Michael Stefszky, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

The Hong-Ou-Mandel (HOM) effect describes the quantum interference of indistinguishable photons on a beam splitter, and is one of the most celebrated effects in quantum optics. It provides a fundamental building block of many technological applications, including linear optical quantum computation and (Gaussian) boson sampling. In this work we explore the implementation of HOM type effects in the spectral domain of optical fields, which could help in the efforts of scaling up the dimensionality of the mentioned technologies. Our spectral domain approach achieves the required beam splitter like operation between different frequency bins, using a so called multi-output quantum pulse gate (mQPG). This is a frequency conversion based device, implemented in dispersion engineered LiNbO₃ waveguides, which allows to interfere programmable superpositions of frequency bins in different output frequency channels. In our scheme we consider frequency entangled photon pairs generated in a type-0 parametric down conversion source as the input to the frequency beam splitter to observe the bunching in the output channels of the mQPG. Here, we report the progress of this ongoing project.

Keywords: Nonlinear optics; Quantum networks; Frequency conversion; Integrated optics; Hong-Ou-Mandel interference