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Q: Fachverband Quantenoptik und Photonik

Q 15: Quantum Information (Quantum Computing and Simulation)

Q 15.4: Vortrag

Dienstag, 15. März 2022, 11:30–11:45, Q-H12

Mimimal number of couplings and local controls for universal quantum computing — •Fernando Gago Encinas, Monika Leibscher, David Pohl, Daniel Basilewitsch, and Christiane Koch — Freie Universität Berlin

Universal quantum computing requires evolution-operator controllability on the circuits used as a platform to perform every possible quantum logic gate. Since we know how to decide for a given system whether it is controllable or not, we can ask how many local controls and 2-qubit couplings are needed. This information is key for building larger and larger devices because these controls and couplings are very expensive in terms of the physical space in the circuit and the calibrations required. We analyze different schemes for a controllable qubit array that minimize these couplings and controls using a special controllability test derived from graph theory. We find that some specific couplings yield better results for controllability and identify some possible candidates to design a scalable modular circuit.