Marina presented her research on improving the quality factor of aluminum 3D cavities. These cavities, when coupled to ancilla qubits, are a great system to store quantum information. She presented a comprehensive study of internal quality factors in a total of 17 cavities of different purity, resonance frequency, and size, subjected to different treatments. Using a recipe including wet etching and annealing, she could reproducibly obtain quality factors in excess of 80 million at the single-photon level, a state-of-the-art figure.
Here research is also published in Appl. Phys. Lett. 117, 070601 (2020) (Editor’s Suggestion).