The germanium quantum information route

G Scappucci, C Kloeffel, FA Zwanenburg… - Nature Reviews …, 2021‏ - nature.com
In the effort to develop disruptive quantum technologies, germanium is emerging as a
versatile material to realize devices capable of encoding, processing and transmitting …

Interfacing spin qubits in quantum dots and donors—hot, dense, and coherent

LMK Vandersypen, H Bluhm, JS Clarke… - npj Quantum …, 2017‏ - nature.com
Semiconductor spins are one of the few qubit realizations that remain a serious candidate
for the implementation of large-scale quantum circuits. Excellent scalability is often argued …

Tunable crossed Andreev reflection and elastic cotunneling in hybrid nanowires

A Bordin, G Wang, CX Liu, SLD Ten Haaf, N Van Loo… - Physical Review X, 2023‏ - APS
A short superconducting segment can couple attached quantum dots via elastic cotunneling
(ECT) and crossed Andreev reflection (CAR). Such coupled quantum dots can host …

Coherent shuttle of electron-spin states

T Fujita, TA Baart, C Reichl, W Wegscheider… - npj Quantum …, 2017‏ - nature.com
We demonstrate a coherent spin shuttle through a GaAs/AlGaAs quadruple-quantum-dot
array. Starting with two electrons in a spin-singlet state in the first dot, we shuttle one …

Three-electron spin qubits

M Russ, G Burkard - Journal of Physics: Condensed Matter, 2017‏ - iopscience.iop.org
The goal of this article is to review the progress of three-electron spin qubits from their
inception to the state of the art. We direct the main focus towards the exchange-only qubit …

Lightly strained germanium quantum wells with hole mobility exceeding one million

M Lodari, O Kong, M Rendell, A Tosato… - Applied Physics …, 2022‏ - pubs.aip.org
We demonstrate that a lightly strained germanium channel (⁠ ε//=− 0.41%⁠) in an undoped
Ge/Si 0.1 Ge 0.9 heterostructure field effect transistor supports a two-dimensional (2D) hole …

Coherent spin-exchange via a quantum mediator

TA Baart, T Fujita, C Reichl, W Wegscheider… - Nature …, 2017‏ - nature.com
Coherent interactions at a distance provide a powerful tool for quantum simulation and
computation. The most common approach to realize an effective long-distance coupling 'on …

Coupled superconducting spin qubits with spin-orbit interaction

M Spethmann, XP Zhang, J Klinovaja, D Loss - Physical Review B, 2022‏ - APS
Superconducting spin qubits, also known as Andreev spin qubits, promise to combine the
benefits of superconducting qubits and spin qubits defined in quantum dots. While most …

Emission of nonclassical radiation by inelastic Cooper pair tunneling

M Westig, B Kubala, O Parlavecchio, Y Mukharsky… - Physical Review Letters, 2017‏ - APS
We show that a properly dc-biased Josephson junction in series with two microwave
resonators of different frequencies emits photon pairs in the resonators. By measuring auto …

Transport signatures of an Andreev molecule in a quantum dot–superconductor–quantum dot setup

Z Scherübl, A Pályi, S Csonka - Beilstein Journal of …, 2019‏ - beilstein-journals.org
Hybrid devices combining quantum dots with superconductors are important building blocks
of conventional and topological quantum-information experiments. A requirement for the …