Low-bandwidth control scheme for an oscillator-stabilized Josephson qubit

R. H. Koch; J. R. Rozen; G. A. Keefe; F. M. Milliken; C. C. Tsuei; J. R. Kirtley; D. P. DiVincenzo

doi:10.1103/PhysRevB.72.092512

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Low-bandwidth control scheme for an oscillator-stabilized Josephson qubit

R. H. Koch, J. R. Rozen, G. A. Keefe, F. M. Milliken, C. C. Tsuei, J. R. Kirtley, D. P. DiVincenzo

DOI 10.1103/PhysRevB.72.092512 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown