Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Quantum Computing and Simulation IV
Q 35.2: Vortrag
Mittwoch, 4. März 2026, 15:00–15:15, P 10
Shortcuts to adiabaticity with a quantum control field — •Emma King1, Giovanna Morigi1,2, and Raphaël Menu1,3 — 1Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — 2Center for Quantum Technologies (QuTe), Saarland University, Campus, 66123 Saarbruecken, Germany — 3CESQ/ISIS (UMR 7006), CNRS and Université de Strasbourg, 67000 Strasbourg, France
Quantum adiabatic dynamics underpins adiabatic quantum computing and quantum annealing. Shortcuts to adiabatic dynamics traditionally use engineered classical drives to suppress non-adiabatic transitions and accelerate protocols. Here we study quantum state transfer in the Landau-Zener model as a minimal setting that captures the essentials of adiabatic evolution, and show that undesired (non-adiabatic) transitions can instead be suppressed by autonomous quantum control. This involves coupling the Landau-Zener qubit to an auxiliary quantum system. By tuning the frequency and interaction strength we modify the joint spectrum and composite quantum dynamics such that the probability of non-adiabatic transitions is reduced by more than two orders of magnitude in favorable regimes. We further identify a practical trade-off: relaxed requirements on the final time precision can be compensated by a longer evolution window. Importantly, the suppression of non-adiabatic transitions also persists in the presence of weak decoherence. Our results provide a clear example where the quantum nature of the control subsystem implements an effective shortcut to adiabaticity without relying on externally engineered classical fields.
Keywords: Adiabatic quantum dynamics; Shortcuts to adiabaticity; Autonomous quantum control; Open quantum system; Strong-coupling