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Multiplexed Qubit Readout Quality Metric Beyond Assignment Fidelity by Di Giovanni, Andras; Aasen, Adrian Skasberg; Lisenfeld, Jürgen; Gärttner, Martin; Rotzinger, Hannes; Ustinov, Alexey V. is a scholarly article available to read on EtoBox.

What is Multiplexed Qubit Readout Quality Metric Beyond Assignment Fidelity about?

The accurate measurement of quantum two-level objects (qubits) is crucial for developing quantum computing hardware. Over the last decade, the measure of choice for benchmarking readout routines for superconducting qubits has been assignment fidelity. However, this method only focuses on the preparation of computational basis states and therefore does not provide a complete characterization of the readout. Here, we expand the focus to the use of detector tomography to fully characterize multi-qubit readout of superconducting transmon qubits. The impact of different readout parameters on the rate of information extraction is studied using quantum state reconstruction infidelity as a proxy. The results are then compared with assignment fidelities, showing good agreement for separable two-qubit states. We therefore propose the rate of infidelity convergence as an alternative and more comprehensive benchmark for single- and multi-qubit readout optimization. We find the most effective allocation of a fixed shot budget between detector tomography and state reconstruction in single- and two-qubit experiments. To address the growing interest in three-qubit gates, we perform three-qubit qua

Author

Di Giovanni, Andras; Aasen, Adrian Skasberg; Lisenfeld, Jürgen; Gärttner, Martin; Rotzinger, Hannes; Ustinov, Alexey V.

Published

2025

Language

EN