Extended Data Table 2.

Average two-qubit gate benchmarks

Data shown are for the qubits of ibm_peekskill used in this work. CX gates, constructed from echoed cross-resonance pulse sequences, are specified in one direction, with the reverse directions accessed by the addition of single-qubit gates. Error per gate (EPG) is extracted from isolated two-qubit randomized benchmarking (spectator qubits idling). The notation * denotes error rates for the best performing physical qubit pair on ibm_peekskill during unencoded magic state preparation experiments defining the minimum (red line) in Fig. 3.