Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Computing and Simulation II

Q 68.2: Vortrag

Freitag, 15. März 2024, 14:45–15:00, HS 1199

Towards Photonic Cluster-State Generation — •Thomas Häffner, Siavash Qodratipour, and Oliver Benson — Nano-Optik, Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Deutschland

Fusion-based linear optical quantum computing (LOQC) is a promising platform, where the complexity is shifted from two-qubit gates to the generation of a resource state, a highly entangled cluster state [1]. As the goal is an integrated photonic implementation of such a quantum computer, our experiment is completely in optical fibers. Therefore a suitable choice for qubits is the time-bin degree of freedom of single photons. Time-bin entangled pairs of two single photons are generated in a type-II periodically-poled LiNbO3 waveguide by a pulsed laser source [2]. We show Hong-Ou-Mandel (HOM) interference between two photons of two subsequent time-multiplexed pairs. The visibility of the HOM interference is a measure of the pureness and indistinguishability of single photons, which are necessary to efficiently entangle photons into cluster states. Multi-pair generation decreases the visibility of the HOM interference. A time-multiplexed pseudo-photon-number-resolving detector was built and is used to optimize the probability of generating exactly one photon pair per pump pulse. Recent results of the experimental implementation towards a time-bin fusion gate will be presented. [1] Bartolucci, S. et al. Fusion-based quantum computation. Nat. Commun. 14, 912 (2023) [2] Montaut, N. et al. High-Efficiency Plug-and-Play Source of Heralded Single Photons. Phys. Rev. Applied 8, 024021 (2017)

Keywords: Quantum Optics; Quantum Computing; Photonics