Coherent flux qubits for quantum annealing (Experiment)

The Annealing-Based Variational Quantum Processors (AVaQus) project is an European consortium aiming to produce a coherent quantum annealing prototype with capability to operate annealing-based operations as well as variational-type quantum algorithms. The final prototype will consist of five coupled coherent flux qubits. This talk presents the experimental implementation of the theoretical description from the previous talk.

In this work, we present the first characterization of several coherent flux qubit designs fabricated on a single silicon chip. Six flux qubits are each coupled to a different resonator, which is connected to a common feedline. We present spectroscopy and time domain measurements for each design. In the light of the results obtained we will motivate our flux qubit design of choice for the final AVaQuS prototype chip.