Fig. 1: Schematic diagram of the cross-platform comparison.
a Test quantum circuit, represented by unitary operator V for state preparation, with appended random rotations ui to each qubit i for measurements in a random (particular) basis. b The circuits are transpiled for different quantum platforms into their corresponding native gates. Each of the MU circuits is repeated MS times for each platform. c The measurement results are sent to a central data repository for processing the fidelities defined in Eq. (1). As an example, d The cross-platform fidelity results for a 5-qubit GHZ state, including a row of comparisons between each of the six hardware systems and theory (labeled "simulation"). Entry i,  j corresponds to the cross-platform fidelity between platform-i and platform-j. The cross-platform fidelity is inferred from MU = 100 randomized measurements and MS = 2000 repetitions for each U.
