Calibration of flux crosstalk in large-scale flux-tunable superconducting quantum circuits

Abstract

Magnetic flux tunability is an essential feature in most approaches to quantum computing based on superconducting qubits. Independent control of the fluxes in multiple loops is hampered by crosstalk. Calibrating flux crosstalk becomes a challenging task when the circuit elements interact strongly. We present a novel approach to flux crosstalk calibration, which is circuit model independent and relies on an iterative process to gradually improve calibration accuracy. This method allows us to reduce errors due to the inductive coupling between loops. The calibration procedure is automated and implemented on devices consisting of tunable flux qubits and couplers with up to 27 control loops. We devise a method to characterize the calibration error, which is used to show that the errors of the measured crosstalk coefficients are all below 0.17%.

22 pages, 15 figures

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Cited by in corpus (8)

• Demonstration of tunable three-body interactions between superconducting qubits
• Cancelling microwave crosstalk with fixed-frequency qubits
• Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
• Tunable Coupler for Mediating Interactions between a Two-Level System and a Waveguide from a Decoupled State to the Ultra-Strong Coupling Regime
• Active Learning of Quantum System Hamiltonians yields Query Advantage
• Role of parasitic interactions and microwave crosstalk in dispersive control of two superconducting artificial atoms
• Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain
• Optimizing for periodicity: a model-independent approach to flux crosstalk calibration for superconducting circuits