Improvement strategies for multiplexed readout of superconducting qubits with fidelity beyond 99%*

We present our recent results on improving single-shot readout fidelity of superconducting qubits utilizing various techniques. We take advantage of higher energy levels of the qubits to circumvent the coherence limit, apply additional readout tones to extract more information and employ machine learning algorithms to improve classification success probabilities. With these mitigation strategies, we boost our readout fidelity for a multi-qubit system beyond 99%.