True-Q™ provides the following error diagnostic protocols. See Introduction to Protocols for an overview of the steps each error diagnostic protocol uses to characterize a device.
- Streamlined Randomized Benchmarking (SRB)
Estimates the average gate fidelity over the Clifford group acting on a subset of qubits.
- Interleaved Randomized Benchmarking (IRB)
Enhances SRB by estimating the average gate fidelity of specific gates, including error analysis that accounts for systematic effects.
- Extended Randomized Benchmarking (XRB)
Enables users to distinguish systematic (coherent) errors from stochastic errors (such as decoherence, dephasing, and rapid fluctuations in control frequencies) in combination with SRB.
- Cycle Benchmarking (CB)
A more practical alternative to SRB for multi-qubit systems that uses simpler randomizing gates, accommodates non-Clifford interleaved gates, and provides more fine-grained information about the noise.
- K-body Noise Reconstruction (KNR)
Systematically and efficiently reconstructs the action of the global error distribution on subsets of qubits.
Composite protocols leverage more basic diagnostic protocols to provide higher-level assessments of quantum hardware performance. True-Q™ currently contains two composite protocols:
- Crosstalk Diagnostics (CTD)
Measures the discrepancy between gate quality while applying gates simultaneously versus while applying gates in an isolated way to each individual subsystem.