Methods for Measuring Magnetic Flux Crosstalk Between Tunable Transmons

Abstract

In the gate model of quantum computing, a program is typically decomposed into a sequence of 1- and 2-qubit gates that are realized as control pulses acting on the system. A key requirement for a scalable control system is that the qubits are addressable - that control pulses act only on the targeted qubits. The presence of control crosstalk makes this addressability requirement difficult to meet. In order to provide metrics that can drive requirements for decreasing crosstalk, we present three measurements that directly quantify the DC and AC flux crosstalk present between tunable transmons, with sensitivities as fine as 0.001%. We develop the theory to connect AC flux crosstalk measures to the infidelity of a parametrically activated two-qubit gate. We employ quantum process tomography in the presence of crosstalk to provide an empirical study of the effects of crosstalk on two-qubit gate fidelity.

arXiv comment10 pages, 8 figures; added additional references to introduction; add appendix "AC Crosstalk as Function of Frequency", misc clarifications; add anc file

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Cited by in corpus (20)

• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• Implementation of the XY interaction family with calibration of a single pulse
• Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
• Mitigation of frequency collisions in superconducting quantum processors
• Simulating and mitigating crosstalk
• Calibration of flux crosstalk in large-scale flux-tunable superconducting quantum circuits
• Signal crosstalk in a flip-chip quantum processor
• Experimental Realization of Nonadiabatic Holonomic Single-Qubit Quantum Gates with Two Dark Paths in a Trapped Ion
• Cancelling microwave crosstalk with fixed-frequency qubits
• Fast flux control of 3D transmon qubits using a magnetic hose
• Blueprint for all-to-all connected superconducting spin qubits
• Control and mitigation of microwave crosstalk effect with superconducting qubits
• Learning-based Calibration of Flux Crosstalk in Transmon Qubit Arrays
• Active Learning of Quantum System Hamiltonians yields Query Advantage
• A Review of Design Concerns in Superconducting Quantum Circuits
• Optimized Noise Suppression for Quantum Circuits
• Superconducting-semiconducting voltage-tunable qubits in the third dimension
• Optimizing for periodicity: a model-independent approach to flux crosstalk calibration for superconducting circuits
• Flux-Trapping Fluxonium Qubit
• The perfect entangler spectrum as a tool to analyze crosstalk