Seminar: Timothy Proctor

Characterizing drift qubits

Timothy Proctor, Sandia National Laboratories

It is essential to benchmark and characterize real-world qubits in order to understand whether they are of sufficient quality for quantum information tasks, and if they are not, so that they can be debugged. Many techniques are designed for qubits that stay constant in time, but in reality almost all qubits suffer from some form of time-dependence. I present methods for detecting and characterizing any changes of a qubit with time, based on simple statistical tools and spectral analysis of "time-stamped" measurement outcomes. These techniques can be integrated into current standard-practice protocols, such as randomized benchmarking or gate-set tomography.