This article provides an overview of an eight-qubit unit cell in a Rainier processor — what it is, what it does, and how well it does it. You can find the article on the arxiv here.
Here is the article’s abstract:
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 a sparse network of analog control lines has been studied. The architecture of the chip and the infrastructure used to control it were designed to facilitate the implementation of an adiabatic quantum optimization algorithm. The performance of an eight-qubit unit cell on this chip has been characterized by measuring its success in solving a large set of random Ising spin glass problems as a function of processor temperature. The experimental data are consistent with the predictions of a quantum mechanical model of an eight-qubit system coupled to an environment in thermal equilibrium. These results highlight many of the key practical challenges that we have overcome and those that lie ahead in the quest to realize a functional large scale adiabatic quantum information processor.