Silicon Quantum Electronics

TL;DR: The (31)P nuclear spin sets the new benchmark coherence time of any single qubit in the solid state and reaches >99.99% control fidelity, and detailed noise spectroscopy indicates that--contrary to widespread belief--it is not limited by the proximity to an interface.

TL;DR: In this article, the authors review several strategies that are considered to address this crucial challenge in scaling quantum circuits based on electron spin qubits. But, the wiring and interconnect requirements for quantum circuits are completely different from those for classical circuits, as individual direct current, pulsed and in some cases microwave control signals need to be routed from external sources to every qubit.

TL;DR: The bottom-up synthesis of width-modulated armchair graphene nanoribbon heterostructures, obtained by fusing segments made from two different molecular building blocks are demonstrated, demonstrating molecular-scale bandgap engineering, including type I heterojunction behaviour.

TL;DR: It is demonstrated that valley separation can be accurately tuned via electrostatic gate control in a metal-oxide-semiconductor quantum dot, providing splittings spanning 0.3-0.8 meV, with a ratio in agreement with atomistic tight-binding predictions.

TL;DR: It is demonstrated that valley separation can be accurately tuned via electrostatic gate control in a metal-oxide-semiconductor quantum dot, providing splittings spanning 0.3-0.8 meV, with a ratio in agreement with atomistic tight-binding predictions.

TL;DR: It is shown that the Hahn-echo coherence time of electron spins associated with divacancy defects in 4H–SiC reaches 1.3 ms, one of the longest coherence times of an electron spin in a naturally isotopic crystal, and points to polyatomic crystals as promising hosts for coherent qubits in the solid state.

TL;DR: This work employs density functional theory calculations to show that van der Waals stacking can significantly modulate Schottky barrier heights in the contact formed between multilayer InSe and 2D metals by suppressing the FLP effect.

TL;DR: In this article, the physics of holes in low-dimensional germanium structures with key insights from a theoretical perspective are introduced and a review of the most significant experimental results demonstrating key building blocks for quantum technology, such as an electrically driven universal quantum gate set with spin qubits in quantum dots and superconducting pairing correlations.