Scalable Suppression of XY Crosstalk by Pulse-Level Control in Superconducting Quantum Processors

• URL: http://arxiv.org/abs/2601.05231v1
• Date: Thu, 08 Jan 2026 18:56:03 GMT
• Title: Scalable Suppression of XY Crosstalk by Pulse-Level Control in Superconducting Quantum Processors
• Authors: Hui-Hang Chen, Chiao-Hsuan Wang,
• Abstract summary: High-performance quantum control is increasingly critical in superconducting quantum processors.<n>In particular, unwanted interactions between nearby qubits give rise to crosstalk errors that limit operational performance.<n>Here, we propose a scalable pulse-level control framework to suppress XY crosstalk errors.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: As superconducting quantum processors continue to scale, high-performance quantum control becomes increasingly critical. In densely integrated architectures, unwanted interactions between nearby qubits give rise to crosstalk errors that limit operational performance. In particular, direct exchange-type (XY) interactions are typically minimized by designing large frequency detunings between neighboring qubits at the hardware level. However, frequency crowding in large-scale systems ultimately restricts the achievable frequency separation. While such XY coupling facilitates entangling gate operations, its residual presence poses a key challenge during single-qubit controls. Here, we propose a scalable pulse-level control framework, incorporating frequency modulation (FM) and dynamical decoupling (DD), to suppress XY crosstalk errors. This framework operates independently of coupling strengths, reducing calibration overhead and naturally supporting multi-qubit connectivity. Numerical simulations show orders-of-magnitude reductions in infidelity for both idle and single-qubit gates in a two-qubit system. We further validate scalability in a five-qubit layout, where crosstalk between a central qubit and four neighbors is simultaneously suppressed. Our crosstalk suppression framework provides a practical route toward high-fidelity operation in dense superconducting architectures.

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