First observation of superconducting flux qubit in the QCT lab

The QCT group has observed the first superconducting flux qubit in the experimental setup at IFAE. This is a milestone for the group. The chip was designed at IFAE and manufactured in Glasgow as part of the AVaQus Collaboration. The group will soon characterize the qubit spectrum and lifetime.

The image shows the unequivocal sign of the presence of a superconducting qubit. The horizontal line is the resonance frequency of the resonator that is used to measure the qubit. The slight shift in the resonance frequency of the resonator is due to the the hybridization of the eigenstates of the qubit and the resoantor.