Bonn 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

QI: Fachverband Quanteninformation

QI 36: Poster – Quantum Information (joint session QI/Q)

QI 36.56: Poster

Thursday, March 13, 2025, 17:00–19:00, Tent

Efficient quantum control by composite ultrastrong field — •Kremena Parashkevova and Nikolay Vitanov — Center for Quantum Technologies, Faculty of Physics, Sofia University, James Bourchier 5 blvd., 1164 Sofia, Bulgaria

We present a study on coherent quantum control of a qubit by an ultrastrong driving field in the regime where the rotating-wave approximation cannot be applied. The resulting counter-rotating term makes traditional quantum control methods, such as resonant, adiabatic and shortcut techniques, unable to achieve high control accuracy. We identify the recently developed universal composite pulses as the only quantum control method which successfully maintains very high accuracy even in this ultrastrong coupling regime.

Keywords: Quantum control methods; Composite pulse techniques; Ultrastrong coupling regime; Rotating-wave approximation