This article presents a protocol for cross-platform comparison of spatially and temporally separated quantum processes. The protocol uses single-qubit unitary gates and classical communication between quantum computers, without requiring quantum links or ancilla qubits. This approach allows for accurate estimation of the performance of quantum devices manufactured in separate laboratories and companies using different technologies. The protocol was applied to compare the performance of five quantum devices from IBM and the “Qianshi” quantum computer from Baidu, all via the cloud. The numerical analysis shows that the protocol scales exponentially as with b ≈ 2, which is much more favorable concerning the system size when compared to full quantum process tomography.
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