Superconducting devices articles from across Nature Portfolio

Cluster states are a key resource in quantum technologies, but generation of large-scale 2D cluster states faces several difficulties. Here, the authors show how to generate a 2 × n ladder-like cluster state via sequential emission of time- and frequency multiplexed photonic qubits from a transmon-based device.

An interconnect based on a low-loss detachable cable connection between two superconducting qubit devices can be used to create elementary quantum networks of interchangeable superconducting quantum devices.

Trapping electrons on a superfluid helium surface provides access to collective quantum phenomena and a platform for circuit quantum electrodynamics (cQED). Here, the authors demonstrate precision spatial and frequency engineering of plasmonic modes in a hybrid electron-on-helium system, opening the door towards integration of plasmon physics within future cQED-like devices.

Electrical transport measurements of magic-angle twisted trilayer graphene are presented.

The authors demonstrate a simple direct-current-measurement characterization of a quarter-wavelength superconducting coplanar waveguide resonator using an on-chip bolometer. This approach offers simpler experimental instrumentation and much larger frequency range of operation compared to traditional RF techniques.

Two papers report advances in high-efficiency superconducting diodes and multiple-diode rectifiers, which are required for the development of power management systems in scalable quantum circuits.

An advance in fabricating superconducting contacts to germanium leads to new tools for controlling the quantum state of electrons in quantum dots.

In a device comprising two double quantum dots separated by a 250-μm-long superconducting resonator, virtual photons in the resonator are shown to mediate the coupling of electron spins between the quantum dots. When the spin–spin coupling is activated for a controlled duration, oscillations between the spins are observed.

Further progress in quantum technologies will require the hybridization of superconducting and photonic platforms. Transparent superconducting oxides would be an ideal solution to avoid substantial losses caused by photon absorption of the superconducting components. Here we present design principles for such materials and discuss the foreseeable prospects of transparent superconductor electronics.

Electrons trapped above the surface of solid neon can be used to create qubits using spatial states with different charge distributions. These charge qubits combine direct electric field control with long coherence times.

Chains of coupled superconducting islands known as Josephson junction arrays were predicted to be insulating at high impedance, but superconducting behaviour has been observed. A study of the arrays’ transport suggests thermal effects are responsible.