Quantum

Nonlocality as a Benchmarking Tool for Quantum Processors

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Briefings

A 2026 study using the Svetlichny inequality benchmarking protocol evaluated two quantum processors: the superconducting system 'Garnet' (IQM) and the ion-trap system 'Marmot' (AQT). The research compared these devices against Mermin's inequality across three to five qubits and full register tests, finding that genuine multipartite nonlocality tests effectively characterize collective performance and guide calibration.

Key points

• The study compares the Svetlichny inequality benchmarking protocol against Mermin's inequality for evaluating quantum processors.
• Two quantum processors were tested: the superconducting system 'Garnet' (IQM) and the ion-trap system 'Marmot' (AQT).

Context

Benchmarking quantum processors is a central task in quantum roadmap development. This study applies the Svetlichny inequality protocol to characterize collective performance and guide calibration for two distinct hardware platforms.

Limitations

Results are limited to two specific processors (Garnet and Marmot) and three to five qubits. Simultaneous triplet tests were conducted across the full register, but specific qubit location dependencies were not fully characterized in this snapshot.

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