Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.42: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Integrated Photonic Quantum Walks for Universal Computation — •Lasse Wendland1, Florian Huber2,3,4, Benedikt Braumandl2,3,4, and Jasmin Meinecke1,2 — 1Institut für Festkörperphysik, Technische Universität Berlin, Berlin, 10623, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3Department für Physik, Ludwig-Maximilians-Universität, München, Germany — 4Munich Center for Quantum Science and Technology (MCQST), München, Germany
As the quantum mechanical analog of a classical random walk, quantum walks offer a powerful framework for advancing various modern quantum technologies. Furthermore, quantum walks can be viewed as a model of computation. In 2009, Andrew M. Childs demonstrated that any quantum circuit can be efficiently simulated by a simple quantum walk on a sparse graph. Although the graph associated with a quantum walk computation is exponentially large in the number of qubits and therefore cannot be efficiently implemented using spatially separated vertices, this model can still serve as a useful testbed for studying quantum walk computations. In our research, we leverage the inherent stability, compactness, and versatility of photonic waveguide arrays as a platform for exploring these computations.
Keywords: quantum walk; integrated photonics; waveguide arrays; quantum computing