Characterizing crosstalk of superconducting transmon processors

Abstract

Currently available quantum computing hardware based on superconducting transmon architectures realizes networks of hundreds of qubits with the possibility of controlled nearest-neighbor interactions. However, the inherent noise and decoherence effects of such quantum chips considerably alter basic gate operations and lead to imperfect outputs of the targeted quantum computations. In this work, we focus on the characterization of crosstalk effects which manifest themselves in correlations between simultaneously executed quantum gates on neighboring qubits. After a short explanation of the physical origin of such correlations, we show how to efficiently and systematically characterize the magnitude of such crosstalk effects on an entire quantum chip using the randomized benchmarking protocol. We demonstrate the introduced protocol by running it on real quantum hardware provided by IBM observing significant alterations in gate fidelities due to crosstalk. Lastly, we use the gained information in order to propose more accurate means to simulate noisy quantum hardware by devising an appropriate crosstalk-aware noise model.

arXiv comment9 pages, 6 figures

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• Efficient quantum algorithm to simulate open systems through a single environmental qubit
• A Review of Design Concerns in Superconducting Quantum Circuits
• Variational Quantum Algorithms for Differential Equations on a Noisy Quantum Computer
• Inverted-circuit zero-noise extrapolation for quantum gate error mitigation
• Machine learning of quantum channels on NISQ devices
• Optimized Noise Suppression for Quantum Circuits
• Hardware-Efficient Preparation of Graph States on Near-Term Quantum Computers
• Optimal number of stabilizer measurement rounds in an idling surface code patch
• Violation of no-signaling on a public quantum computer
• The perfect entangler spectrum as a tool to analyze crosstalk