Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.63: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Controllable Josephson junction for photon Bose-Einstein condensates — •Mario Vretenar, Ben Kassenberg, Shivan Bissesar, and Jan Klaers — University of Twente, Enschede, The Netherlands

Josephson junctions are the basis for many important fields, such as ultrafast electronics with magnetic flux quanta and superconducting quantum computing. The physical predictions of Josephson junctions are highly universal and can be observed in systems as diverse as coupled superconductors, atomic Bose-Einstein condensates, and others. We experimentally demonstrate tunable tunneling between two photon Bose-Einstein condensates by a targeted shaping of the potential landscape acting on the photons during the tunneling process. The investigated device realizes an optical analogue of a 0,π-Josephson junction, which can act as a building block for an ultrafast all-optical spin glass simulator. Such a simulator is expected to solve hard optimization problems orders of magnitude faster and more energy efficient than conventional supercomputers. The potential landscape in our photon Bose-Einstein condensate Josephson junctions is realized by a combination of direct laser writing for permanent mirror nanostructuring, and heating a thermosensitive polymer for runtime fine tuning of couplings.