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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.14: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

SPDC photon pair source for Quantum Random Walk Application on an integrated quantum photonic processor — •Christoph Engelberg, Jonas Philipps, Evelyn Kimmerle, and Florian Elsen — Chair for Laser Technology, RWTH Aachen University

Photonic quantum computing (PQC) is emerging as a promising approach to quantum computing due to photons' near-decoherence-free nature, room temperature operation and high-precision manipulation. One crucial component for PQC are quantum light sources, which can be realized by spontaneous parametric down-conversion (SPDC) photon pair sources. A key requirement for such sources is a high indistinguishability of the photons.

In this work, an SPDC photon pair source at telecom wavelength is set up and characterized with an on-chip integrated quantum photonic processor (QPP). Furthermore, its practical suitability and performance for a potential use in the field of PQC is confirmed. By further performing spectral filtering, a Hong-Ou-Mandel (HOM) interference visibility of 98.41% was achieved. A high indistinguishability of the photons is thereby shown.

A possible PQC application are quantum random walks (QRWs) on a QPP, where a pair of indistinguishable photons is passed through a linear optical network. In a future step, this photon pair source will be used to experimentally and simulatively investigate the influence of the source properties on the performance of QRWs.

Keywords: photon pair source; spontaneous parametric down-conversion (SPDC); Hong-Ou-Mandel (HOM); Photonic Quantum Computing (PQC); Quantum Random Walk (QRW)