Quantum Accreditation with Non-Clifford Two-qubit Gates

TL;DR

This paper introduces scalable quantum accreditation protocols for circuits with non-Clifford two-qubit gates like fSim and XY, ensuring reliable quantum computations on existing hardware.

Contribution

It develops practical protocols that bound error probabilities and extend Pauli twirling to non-Pauli bases, advancing quantum verification methods.

Findings

Protocols effectively upper-bound error distributions.

Robustness demonstrated against small perturbations.

Generalization of Pauli twirling to non-Pauli bases.

Abstract

We develop a family of quantum accreditation protocols for quantum circuits with non-Clifford two-qubit gates. The latter includes families of gates such as the fSim and XY families of gates, native to existing hardwares. We provide practical and scalable protocols that upper-bound the total variation distance between the probability distributions of error-free and erroneous quantum computations. We also establish the robustness of our protocols to small perturbations and generalize Pauli twirling to non-Pauli single-qubit bases, which may be of independent interest.