Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 16: Quantum Software
QI 16.2: Talk
Thursday, March 12, 2026, 10:00–10:15, BEY/0245
A Framework for Spectator Error Mitigation in Surface-Code Hamiltonian Modeling — •Xuexin Xu1, Mohammad H. Ansari1, and John M. Martinis2 — 1PGI-2, Forschungszentrum Juelich, Juelich, 52428, Germany — 2Qolab, Madison, Wisconsin, 53706, USA
Realistic surface-code architectures rely on precisely engineered single and two-qubit gates across large-scale quantum lattices. Yet subtle whispers from spectator qubits those surrounding but not directly involved in a target operation can disturb intended surface-code Hamiltonian and degrade logical fidelity. We analyze the origin and effects of spectator-induced errors in lattices and propose a mitigation scheme based on the inherent symmetry of spectator qubits. Through numerical simulations and perturbative analysis, we show that our method gently suppresses parasitic effects while boosting the performance of intended two-qubit gates. This approach offers a scalable and systematic path to enhance gate fidelity and tame crosstalk, bringing surface-code quantum processors closer to practical, reliable operation.
Keywords: Quantum Computing; Quantum Gates; Quantum Error Correction; Superconducting Qubits