Optimizing for periodicity: a model-independent approach to flux crosstalk calibration for superconducting circuits
arXiv:2211.01497 · doi:10.1088/2058-9565/ad1ecf
Abstract
Flux tunability is an important engineering resource for superconducting circuits. Large-scale quantum computers based on flux-tunable superconducting circuits face the problem of flux crosstalk, which needs to be accurately calibrated to realize high-fidelity quantum operations. Typical calibration methods either assume that circuit elements can be effectively decoupled and simple models can be applied, or require a large amount of data. Such methods become ineffective as the system size increases and circuit interactions become stronger. Here we propose a new method for calibrating flux crosstalk, which is independent of the underlying circuit model. Using the fundamental property that superconducting circuits respond periodically to external fluxes, crosstalk calibration of N flux channels can be treated as N independent optimization problems, with the objective functions being the periodicity of a measured signal depending on the compensation parameters. We demonstrate this method on a small-scale quantum annealing circuit based on superconducting flux qubits, achieving comparable accuracy with previous methods. We also show that the objective function usually has a nearly convex landscape, allowing efficient optimization.
References in corpus (12)
- Supplementary information for "Quantum supremacy using a programmable superconducting processor"
- Charge insensitive qubit design derived from the Cooper pair box
- Strong quantum computational advantage using a superconducting quantum processor
- Coherent quantum annealing in a programmable 2000-qubit Ising chain
- Controllable coupling of superconducting flux qubits
- Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
- Probing quantum information propagation with out-of-time-ordered correlators
- Moving beyond the transmon: Noise-protected superconducting quantum circuits
- Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
- Tunable and Switchable Coupling Between Two Superconducting Resonators
- Calibration of flux crosstalk in large-scale flux-tunable superconducting quantum circuits
- Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain