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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics (Miscellaneous)

Q 61.1: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Generating multi-photon graph states in the telecom wavelength regime using sagnac single-photon sources — •Nico Hauser, Simone d'Aurelio, Matthias Bayerbach, Shreya Kumar, and Stefanie Barz — Institute for Functional Matter and Quantum Technologies and IQST, University of Stuttgart, 70569 Stuttgart, Germany

Graph states with multiple qubits are important resources for quantum computation and quantum communication. In particular, multipartite communication protocols between three and more parties can benefit from maximally entangled N-qubit states. Examples are quantum secret sharing protocols, quantum conference key agreement and secure quantum e-voting - all of which require a reliable generation of entangled N-qubit states. Therefore, the experimental generation of such states is of great importance, in particular, in the telecom wavelength regime in order to use existing and well established fiber networks. In this work, we investigate the generation of multipartite entangled states using single photon sources based on spontaneous parametric down-conversion in ppKTP-crystals. The sources are operated in a sagnac interferometer type scheme that allows generating two-photon Bell states. Fusing multiple of those states at beam splitters then creates multipartite entangled states. These can then serve as the basis for implementing multipartite communication protocols.