Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.12: Poster

Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer

Optimizing efficiencies in time-multiplexed photonic quantum walks — •Philip Held, Vincent Borlisch, Federico Pegoraro, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Germany

Quantum walks function as essential means to implement quantum simulators, allowing one to study complex quantum processes that often cannot be directly accessed in the laboratory. Time-multiplexed photonic quantum walks offer the possibility to build easily scalable systems. Here the position space of the walk is mapped to temporal bins and physical elements of the setup are used time and again. Experimentally this is implemented by realizing a looped structure, such that each step is implemented by one roundtrip through the setup. Thus, the overall losses - wich constitute the main limitation of the system - are mainly determined by the roundtrip losses that scale exponentially with the step number. In this contribution, we present a new scheme to build time-multiplexed photonic quantum walks. We were able to reduce the number of required optical components and improve the spatial mode matching of the optical paths. The new setup architecture features a smaller, compact footprint, higher long-term stability, and a reduction of losses by more than 25% compared to the original version. We now achieve a round-trip efficiency of 86%, which reduces the measurement time by an order of magnitude for a 20-step two-photon quantum walk.

Keywords: Quantum Walks; Quantum Technologies; Scalability; Quantum Simulation