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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.31: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent B

Development of time-multiplexed fiber-based quantum walks — •Moritz Borchardt, Federico Pegoraro, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany

The random walk stands as a powerful tool within the realm of computer science. Its quantum mechanical counterpart, referred to as the quantum walk, opens up avenues for developing even more efficient algorithms tailored to address both current and future (quantum) computing challenges. Among various possibilities, photonic based implementations have proven to be advantageous in terms of resources needed to realize the quantum walk evolution. Due to complex alignment procedures and large system size, opting for partial integration seems to be a reasonable approach in terms of scaling. Additionally, recent results highlight that achieving the necessary modulation speed, crucial for effective quantum computing, is only feasible through the use of integrated modulators. In fact, integrated thin-film lithium niobate modulators have shown bandwidths in excess of 100 GHz. Here we take a step in this direction and present an implementation of an integrated time-multiplexed quantum walk that relies only on fiber loops and directional couplers. We experimentally demonstrate the quantum walk dynamics, and we investigate effects of unbalanced losses in the setup with an outlook on dynamic implementations requiring fiber based active components that would have an impact on the system efficiency.

Keywords: Quantum Walks; Quantum Technologies; Quantum Simulation; Integrated Optics; Time-Multiplexing