In situ Tuning of the Electric-Dipole Strength of a Double-Dot Charge Qubit: Charge-Noise Protection and Ultrastrong Coupling

P. Scarlino, 2 J. H. Ungerer, ∗ D. J. van Woerkom, † M. Mancini, P. Stano, 4, 5 C. Müller, A. J. Landig, J. V. Koski, † C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin, and A. Wallraff 7 Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia IBM Quantum, IBM Research Zurich, CH-8803 Rüschlikon, Switzerland Quantum Center, ETH Zurich, 8093 Zurich, Switzerland (Dated: September 9, 2021)