Undesired coupling to the surrounding environment destroys long-range correlations on
quantum processors and hinders the coherent evolution in the nominally available
computational space. This incoherent noise is an outstanding challenge to fully leverage the
computation power of near-term quantum processors. It has been shown that benchmarking
Random Circuit Sampling (RCS) with Cross-Entropy Benchmarking (XEB) can provide a
reliable estimate of the effective size of the Hilbert space coherently available. The extent to …