Adiabatic quantum computation with flux qbits

Abstract

We propose a superconducting device for adiabatic quantum computation with flux qbits. This system includes rf SQUIDs coupled via a superconducting flux transformer especially designed for obtaining an anti-ferromagnetic coupling. Moreover we have characterized a niobium-based vertical Josephson interferometer to be included in a superconducting loop for applications to quantum computation using flux qbits. The most interesting feature of this device is that the Josephson current is precisely modulated by a small transversal magnetic field parallel to the superconducting loop plane, from a maximum to zero with fine control and precision. This vertical interferometer can be used to independently control the off-diagonal Hamiltonian terms of flux qbits and/or to control the flux transfer function of a superconducting transformer for inter-qbits coupling. © 2006 Springer Science+Business Media, Inc.