Fig. 4: Comparison with a Markov model.
From: Demonstration of non-Markovian process characterisation and control on a quantum processor
We benchmark the accuracy with which different techniques can predict the outcome of a given process for 64 circuits. When nearby qubits are initialised as \(\left|0\right\rangle\), the median fidelity from GST is similar to the process tensor in each scenario. When the neighbouring qubits are in state \(\left|+\right\rangle\), however, GST suffers from a fidelity drop of about 1.2%. This is a demonstration of how a technique like the process tensor could complement existing characterisation techniques in realistic non-Markovian settings.
