Transforming stand-alone qubits into a functional, general-purpose quantum processing unit
requires an architecture where many-body quantum entanglement can be generated and …

Superconducting qubits provide a promising path toward building large-scale quantum
computers. The simple and robust transmon qubit has been the leading platform, achieving …

High-fidelity and rapid readout of a qubit state is key to quantum computing and
communication, and it is a prerequisite for quantum error correction. We present a readout …

Currently available quantum processors are dominated by noise, which severely limits their
applicability and motivates the search for new physical qubit encodings. In this work, we …

The innate complexity of solid-state physics exposes superconducting quantum circuits to
interactions with uncontrolled degrees of freedom degrading their coherence. By …

We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with
transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at …

Approaches to developing large-scale superconducting quantum processors must cope with
the numerous microscopic degrees of freedom that are ubiquitous in solid-state devices …

Residual noise photons in a readout resonator become a major source of dephasing for a
superconducting qubit when the resonator is optimized for a fast, high-fidelity dispersive …

Mesoscopic Josephson junctions, consisting of overlapping superconducting electrodes
separated by a nanometre-thin oxide layer, provide a precious source of nonlinearity for …

Long coherence times, large anharmonicity, and robust charge-noise insensitivity render
fluxonium qubits an interesting alternative to transmons. Recent experiments have …