title: Observation of Floquet States in a Strongly Driven Artificial Atom.
abstract: We present experiments on the driven dynamics of a two-level superconducting artificial atom. The driving strength reaches 4.78 GHz, significantly exceeding the transition frequency of 2.288 GHz. The observed dynamics is described in terms of quasienergies and quasienergy states, in agreement with Floquet theory. In addition, we observe the role of pulse shaping in the dynamics, as determined by nonadiabatic transitions between Floquet states, and we implement subnanosecond single-qubit operations. These results pave the way to quantum control using strong driving with applications in quantum technologies.
authors.affiliation: Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Chunqing
authors.initials: C
authors.lastname: Deng
authors.affiliation: Institute for Quantum Computing, Department of Electrical and Computer Engineering, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Orgiazzi
authors.affiliation: Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Feiruo
authors.initials: F
authors.lastname: Shen
authors.affiliation: Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar.
authors.forename: Sahel
authors.initials: S
authors.lastname: Ashhab
authors.affiliation: Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: Adrian
authors.initials: A
authors.lastname: Lupascu