Optimizing Control of Quantum Information in Higher Dimensions

Explore the optimization of quantum information control in higher dimensions through this 20-minute conference talk presented by Sahel Ashhab from the National Institute of Information and Communications Technology. Delve into two key aspects of quantum information processing: qutrit control and speed limits for two-qubit gates with weakly anharmonic qubits. Discover how superconducting devices can be used to encode qudits and learn about the optimal implementation of single-qudit gates. Investigate the use of optimal control theory to determine maximum achievable gate speeds for two-qubit gates in the qubit subspace of many-level Hilbert spaces. Examine the competing mechanisms of stronger coupling between higher energy levels and the constraints imposed by weak anharmonicity on quantum system control. Gain insights into optimized gate implementations and guidelines for desirable anharmonicity conditions in realistic systems. This talk, presented at the QuDits for Quantum Technology workshop hosted by the Quantum Interactions Theory Group at the Institute for Quantum Computing, University of Waterloo, is supported by the MEXT Quantum Leap Flagship Program.