Two-qubit Pauli-frame randomization in a superconducting system*

Coherent noise and non-Markovianity are projected to be significant sources of non-ideal behavior in large scale quantum computers. One approach to dealing with such noise sources is called Randomized Compiling where quantum circuits are permuted by the insertion of random gates whose effect is tracked and inverted at the end of the circuit on a shot-by-shot basis. While this technique effectively removes coherent error and significantly reduces non-Markovianity, it can be quite challenging to implement experimentally due to the large number of random circuits that need to be generated and data that needs to be post processed. To remove some of the experimental overhead, we have implemented control system firmware that randomizes quantum circuits on-the-fly using custom control electronics. Here we build on previous work accomplishing this in a single qubit system extending it to circuits with two qubit gates.

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