2009/05/31 by William D. Oliver, Sergio O. Valenzuela · 1 citation
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1007/s11128-009-0108-y
published as Quantum Inf. Process. 8, 261-281 (2009) · 13 pages, 5 figures
arxiv created 2009/05/31 · arxiv updated 2009/12/01
Superconducting persistent-current qubits are quantum-coherent artificial atoms with multiple, tunable energy levels. In the presence of large-amplitude harmonic excitation, the qubit state can be driven through one or more of the constituent energy-level avoided crossings. The resulting Landau-Zener-Stueckelberg (LZS) transitions mediate a rich array of quantum-coherent phenomena. We review here three experimental works based on LZS transitions: Mach-Zehnder-type interferometry between repeated LZS transitions, microwave-induced cooling, and amplitude spectroscopy. These experiments exhibit a remarkable agreement with theory, and are extensible to other solid-state and atomic qubit modalities. We anticipate they will find application to qubit state-preparation and control methods for quantum information science and technology.