Using classical bit-flip correction for error mitigation in quantum computations including 2-qubit correlations
Karl Jansen, Constantia Alexandrou, Lena Funcke, Tobias Hartung, Stefan Kuehn, Georgios Polykratis, Paolo Stornati, Xiaoyang Wang · Proceedings of The 38th International Symposium on Lattice Field Theory — PoS(LATTICE2021) · 2022
We present an error mitigation scheme which corrects readout errors on Noisy Intermediate-Scale Quantum (NISQ) computers [1,2]. After a short review of applying the method to one qubit, we proceed to discuss the case when correlations between different qubits occur. We demonstrate how the readout error can be mitigated in this case. By performing experiments on IBMQ hardware, we show that such correlations do not have a strong effect on the results, justifying to neglect them.