Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 14: QIP Implementations: Solid-State Devices I

MON 14.7: Talk

Monday, September 8, 2025, 18:00–18:15, ZHG002

Robust, fast and high-fidelity composite single-qubit gates for superconducting transmon qubits — •Hristo Tonchev¹, Boyan Torosov², and Nikolay Vitanov¹ — ¹Center for Quantum Technologies, Department of Physics, Sofia University, James Bourchier 5 blvd., 1164 Sofia, Bulgaria — ²Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko chaussee, 1784 Sofia, Bulgaria

We introduce a novel quantum control method for superconducting transmon qubits that significantly outperforms conventional techniques in precision and robustness against coherent errors. Our approach leverages composite pulses (CP) to effectively mitigate system-specific errors, such as qubit frequency and anharmonicity variations. By utilizing CP, we demonstrate both complete and partial population transfers between qubit states, as well as the implementation of two essential single-qubit quantum gates. Simulations reveal substantial reductions in common error rates and gate durations. The effectiveness of our method is validated through four independent verification techniques, underscoring its potential for advancing quantum computing with superconducting qubits.

Keywords: Quantum Control; Composite Pulses; Coherent Control; Quantum Gates; Superconducting Qubits