Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-31
Quantum Inf. Process. 8, 261-281 (2009)
Physics
Condensed Matter
Superconductivity
13 pages, 5 figures
Scientific paper
10.1007/s11128-009-0108-y
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.
Oliver William D.
Valenzuela Sergio O.
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