I have a superconducting system with tens of qubits, each of which can be tuned using DC flux.
One of the main tasks for coherent manipulation of the qubits is to find good idling frequencies and operating points for entangling gates. This effort is confounded by two-level systems (TLS), which cause rapid energy relaxation, and wreak general havok on coherent manipulation.
I spent a long time finding a good set of idling frequencies and operating points, all the while considering the locations of the TLS's, and then one day I came in the the lab and they had moved around! I had to start all over again.
I want to learn more about how and why TLS's move, and whether it's possible to maybe control the movement. As part of my research, I want to poll the community and see what other people's experience with this problem is like.