Low-bandwidth control scheme for an oscillator-stabilized Josephson qubit
R. H. Koch, John Rozen, George Keefe, Frank Milliken, Chang C. Tsuei, J. R. Kirtley, David Peter Divincenzo · Physical Review B · 2005
We introduce a Josephson junction circuit for which quantum operations are realized by low-bandwidth, nearly adiabatic magnetic-flux pulses. Coupling to the fundamental mode of a superconducting transmission line permits a stabilization of the rotation angle of the quantum operation against flux noise. A complete scheme for one-qubit rotations, and high-visibility Ramsey-fringe oscillations, is given. We show that high visibility depends on passing through a portal in the space of applied fluxes, where the width of the portal is proportional to the ramp-up rate of the flux pulse.