Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 44: Focus Session: Quantum Technologies in Deployed Systems I

HL 44.3: Talk

Wednesday, March 19, 2025, 18:30–18:45, H13

Fast and high-fidelity composite gates in superconducting qubits: Beating the Fourier leakage limit — •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 chaussée, 1784 Sofia, Bulgaria

We present a method for quantum control in superconducting transmon qubits, which overcomes the Fourier limit for the gate duration imposed by leakage to upper states. The technique utilizes composite pulses, which allow for the correction of various types of errors that naturally arise in a system. We use our approach to produce complete and partial population transfers between the qubit states, as well as two basic single-qubit quantum gates. Our simulations show a substantial reduction of the typical errors and gate durations. Three different independent verifications are made to justify these claims.

Keywords: Quantum control; Atomic & molecular processes in external fields; Coherent control; Quantum computation; Quantum gates