Using classical bit-flip correction for error mitigation including 2-qubit correlations

TL;DR

This paper introduces an error mitigation scheme for quantum computers that corrects readout errors, including those caused by two-qubit correlations, and demonstrates its effectiveness on IBMQ hardware.

Contribution

The paper extends classical bit-flip correction methods to account for two-qubit correlations in error mitigation on NISQ devices.

Findings

Correlations between qubits have minimal impact on readout errors.

The proposed correction method effectively mitigates errors in quantum readout.

Experimental validation on IBMQ hardware supports the method's practicality.

Abstract

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.