16 research outputs found
Large-amplitude driving of a superconducting artificial atom: Interferometry, cooling, and amplitude spectroscopy
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.Comment: 13 pages, 5 figure
Topological phenomena in quantum walks: elementary introduction to the physics of topological phases
Entanglement generation through the interplay of harmonic driving and interaction in coupled superconducting qubits
Dynamical merging of Dirac points in the periodically driven Kitaev honeycomb model
We study the effect of a half wave rectified sinusoidal electromagnetic (EM)
wave on the Kitaev honeycomb model with an additional magneto-electric coupling
term {arising due to induced polarization of the bonds. Within the framework of
Floquet analysis, we show that merging of a pair of Dirac points in the gapless
region of the Kitaev model leading to a semi-Dirac spectrum is indeed possible}
by externally varying the amplitude and the phase of the EM field.Comment: 10 pages, 7 figures: Text modified and new figures adde