Dresden 2026 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 21: Quantum Information: Concepts and Methods III

QI 21.8: Vortrag

Freitag, 13. März 2026, 12:00–12:15, BEY/0245

Chaotic melting of superconducting quantum chips: Quantum chaos in effective Hamiltonians — •Lucas Resch and Juan Diego Urbina — University of Regensburg

Superconducting qubits, in particular transmons, are at the forefront of quantum computing research [1]. Recent studies have revealed signatures of chaos near the ground state in these systems, challenging the conventional view that chaotic behavior emerges only at high energies [2]. In this work, we analyze spectral statistics, the inverse participation ratio, and the Lyapunov exponent to characterize this chaotic regime. Our results indicate that the observed chaotic features can be attributed to virtual interactions between computational states within an effective low-energy subspace and non-computational states outside it. This reinterpretation clarifies the origin of chaos in transmon-based architectures and provides a framework for understanding its implications for quantum control and device performance.

References

[1] J. M. Gambetta et al., *Building logical qubits in a superconducting quantum computing system,* npj Quantum Information 3, 2 (2017). [2] S. Börner et al., *Classical chaos in quantum computers,* Phys. Rev. Research 6, (2024).

Keywords: Chaotic melting; effective Hamiltonian; Transmon