During the last ten years, superconducting circuits have passed from being interesting
physical devices to becoming contenders for near-future useful and scalable quantum …

Quantum computing is a rapidly develo** field that has the potential to revolutionize the
way we process data. In this article, we will introduce quantum computers, their hardware …

We have integrated single and coupled superconducting transmon qubits into flip-chip
modules. Each module consists of two chips—one quantum chip and one control chip—that …

Quantum processors require a signal-delivery architecture with high addressability (low
crosstalk) to ensure high performance already at the scale of dozens of qubits. Signal …

Superconducting qubits seem promising for useful quantum computers, but the currently
wide-spread qubit designs and techniques do not yet provide high enough performance …

Using quantum systems with more than two levels, or qudits, can scale the computational
space of quantum processors more efficiently than using qubits, which may offer an easier …

In this review, we cover copper-to-copper (Cu-to-Cu) direct bonding, point contact reaction
between silicon (Si) nanowire and metal nanowire, and cold welding of gold (Au) and silver …

A major challenge for scaling up superconducting quantum computers is unwanted
couplings between qubits, which lead to always-on ZZ couplings that impact gate fidelities …

Designing the spatial profile of the superconducting gap—gap engineering—has long been
recognized as an effective way of controlling quasiparticles in superconducting devices. In …

Gate set tomography (GST) characterizes the process matrix of quantum logic gates, along
with measurement and state preparation errors in quantum processors. GST typically …