Publications (11)
Entanglement in a quantum annealing processor
T. Lanting, A. J. Przybysz, A. Yu. Smirnov +23
Entanglement lies at the core of quantum algorithms designed to solve problems that are intractable by classical approaches. One such algorithm, quantum annealing (QA), provides a…
Experimental Investigation of an Eight Qubit Unit Cell in a Superconducting Optimization Processor
R. Harris, M. W. Johnson, T. Lanting +23
A superconducting chip containing a regular array of flux qubits, tunable interqubit inductive couplers, an XY-addressable readout system, on-chip programmable magnetic memory, and…
Experimental Demonstration of a Robust and Scalable Flux Qubit
R. Harris, J. Johansson, A. J. Berkley +16
A novel rf-SQUID flux qubit that is robust against fabrication variations in Josephson junction critical currents and device inductance has been implemented. Measurements of the pe…
Multi-Terminal Superconducting Phase Qubit
M. H. S. Amin, A. N. Omelyanchouk, A. Blais +4
Mesoscopic multi-terminal Josephson junctions are novel devices that provide weak coupling between several bulk superconductors through a common normal layer. Because of the nonloc…
High Temperature PI/2-SQUID
M. H. S. Amin, M. Coury, G. Rose
A new DC-SQUID is proposed that exploits the properties of the grain boundary junctions in high T_c superconductors. The orientations of the grain boundaries are chosen in such a w…
A scalable control system for a superconducting adiabatic quantum optimization processor
M. W. Johnson, P. Bunyk, F. Maibaum +10
We have designed, fabricated and operated a scalable system for applying independently programmable time-independent, and limited time-dependent flux biases to control superconduct…
Landau-Zener Transitions in an Adiabatic Quantum Computer
J. Johansson, M. H. S. Amin, A. J. Berkley +7
We report an experimental measurement of Landau-Zener transitions on an individual flux qubit within a multi-qubit superconducting chip designed for adiabatic quantum computation.…
A scalable readout system for a superconducting adiabatic quantum optimization system
A. J. Berkley, M. W. Johnson, P. Bunyk +7
We have designed, fabricated and tested an XY-addressable readout system that is specifically tailored for the reading of superconducting flux qubits in an integrated circuit that…
Persistent currents in mesoscopic rings and boundary conformal field theory
S. Jaimungal, M. H. S. Amin, G. Rose
A tight-binding model of electron dynamics in mesoscopic normal rings is studied using boundary conformal field theory. The partition function is calculated in the low energy limit…
Short Time Quantum AC response of a system of Nanomagnets
G. Rose, P. C. E. Stamp
We calculate the magnetisation relaxation in the short-time regime for an ensemble of nanomagnets in the presence of a low-frequency external AC biasing field, at temperatures lowe…
Observation of Co-tunneling in Pairs of Coupled Flux Qubits
T. Lanting, R. Harris, J. Johansson +17
We report measurements of macroscopic resonant tunneling between the two lowest energy states of a pair of magnetically coupled rf-SQUID flux qubits. This technique provides a dire…