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QI: Fachverband Quanteninformation
QI 40: Quantum Control II (joint session QI/Q)
QI 40.7: Talk
Friday, March 14, 2025, 12:30–12:45, HS II
Motion-Insensitive Time-Optimal Control of Optical Qubits — •Léo Van Damme1, Zhao Zhang2, Amit Devra1, Steffen J. Glaser1, and Andrea Alberti2 — 1School of Natural Sciences, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Ultranarrow optical transitions, widely used in modern atomic clocks, are gaining significant attention for quantum computing applications. However, optical qubits are highly susceptible to motion-induced decoherence and photon-recoil heating, which, if unaddressed, pose critical barriers to the realization of large-scale quantum circuits.
In this work, we demonstrate that these effects can be controlled by modulating the phase of the driving laser field over time, for general quantum gates and arbitrary initial atomic states.
We have developed a method that reduces the problem of infinite motional states to a set of constraints on a two-level system. This dramatic simplification, combined with optimal control techniques, reveals that optimal solutions not only substantially improve gate fidelity and speed but are also feasible for practical implementation.
Keywords: Trapped atoms; Optimal control; Qubit gates; Photon recoil; Pulse design