In this talk, I will present my PhD research focussed on the mitigation of readout errors in superconducting qubit devices. I will touch on how readout errors can arise and why we should care about them. I will introduce methods based on quantum detector tomography and quantum state tomography for single- and multi-qubit systems. The two main questions I will aim to answer are: How can we use detector tomography to better understand quantum devices and mitigate readout errors? Can we use detector tomography to find optimal operating parameters for multiplexed readout? 

 

A. Aasen, A. Di Giovanni et al: Readout error mitigated quantum state tomography tested on superconducting qubits. Communications Physics volume 7, Article number: 301 (2024)

 

A. Di Giovanni, A. Aasen et al: Multiplexed qubit readout quality metric beyond assignment fidelity https://arxiv.org/abs/2502.08589 (2025)