Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 8: Quantum Computing Theory I
QI 8.3: Talk
Monday, March 10, 2025, 17:45–18:00, HS IV
Real-time measurement error mitigation for one-way quantum computation — Tobias Hartung1, •Stephan Schuster2, Joachim von Zanthier2, and Karl Jansen3 — 1Northeastern University - London — 2Quantum Optics and Quantum Information Group, Friedrich-Alexander-Universität Erlangen-Nürnberg — 3Center for Quantum Technology and Applications (CQTA), Desy Zeuthen
We present a quantum error mitigation method for single-qubit measurements, particularly suited for one-way quantum computation. Our method is capable of mitigating errors of single-shot measurements in real-time, i.e., during the processing measurements of a one-way quantum computation and avoids any preceding calibration measurements. For that, we utilize an ancillary qubit register which is entangled with the to-be measured qubit and is additionally measured afterwards. Occurring measurement errors can then be mitigated in real-time by applying a voting protocol to all measurement outcomes, while the computation proceeds. We provide analytical expressions for the remaining missidentifaction probability of a measurement outcome, in dependence of the error rate and the ancilla register size, and for the required register size to fall below a certain missidentification rate, in dependence of the measurement error rate. Additionally, we show in proof-of-principle simulations that our method can reduce the measurement errors significantly using only a small number of ancilla qubits.
Keywords: measurement-based quantum computation; quantum computation; error mitigation