Mitigation of Crosstalk Errors in Quantum Measurements

Understand

In the present-day quantum information technologies, measurements are performed not only at the end of quantum state evolution but also between quantum circuits to connect short-depth quantum circuits, for instance, variational quantum algorithms.

• Furthermore, measurements also contain crosstalk errors, which cannot be factorized into individual readout errors.
• In this work, we investigate methods for mitigating measurement errors across multiple qubits, particularly measurement crosstalk that cannot be corrected by methods for correcting individual readout errors.
• We present mitigation protocols that generally suppress these errors by up to a percentage level across multiple qubits.