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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.18: Poster
Wednesday, March 11, 2026, 18:00–21:00, P4
Effect of Long-range Crosstalk Errors on the Surface Code — •Solomon Birhanu Samuel1 and Janos Karoly Asboth1,2,3 — 1Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3., H-1111 Budapest, Hungary — 2HUN-REN Wigner Research Centre for Physics, H-1525 Budapest, P.O. Box 49., Hungary — 3HUN-REN-BME-BCE Quantum Technology Research Group, Muegyetem rkp. 3., H-1111 Budapest, Hungary
Crosstalk errors (due to unintended interactions between qubits and coupling between different circuit elements) pose a challenge to quantum error correction. They are often assumed to only affect nearest or next-nearest neighbor qubits[1], but experiments on some superconducting quantum processors[2] show that they can occur between more distant qubits as well. In this work, we study the effect of longer-range crosstalk errors on the surface code using numerical models (Clifford simulation) with realistic parameters of superconducting chips. We use Pauli error models to simulate the effect of the crosstalk both on the threshold and the logical error rate below threshold.
[1] Zhou, Zeyuan, Andrew Ji, and Yongshan Ding. "Surface Code Error Correction with Crosstalk Noise." arXiv preprint arXiv:2503.04642 (2025).
[2] Kosen, Sandoko, et al. "Signal crosstalk in a flip-chip quantum processor." PRX Quantum 5.3 (2024): 030350.
Keywords: signal crosstalk; surface code; pauli twirling; QEC code threshold