Semiconductor spin qubits

G Burkard, TD Ladd, A Pan, JM Nichol, JR Petta - Reviews of Modern Physics, 2023‏ - APS
The spin degree of freedom of an electron or a nucleus is one of the most basic properties of
nature and functions as an excellent qubit, as it provides a natural two-level system that is …

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 …

Fast two-qubit logic with holes in germanium

NW Hendrickx, DP Franke, A Sammak, G Scappucci… - Nature, 2020‏ - nature.com
Universal quantum information processing requires the execution of single-qubit and two-
qubit logic. Across all qubit realizations, spin qubits in quantum dots have great promise to …

A germanium hole spin qubit

H Watzinger, J Kukučka, L Vukušić, F Gao… - Nature …, 2018‏ - nature.com
Holes confined in quantum dots have gained considerable interest in the past few years due
to their potential as spin qubits. Here we demonstrate two-axis control of a spin 3/2 qubit in …

Ultrafast coherent control of a hole spin qubit in a germanium quantum dot

K Wang, G Xu, F Gao, H Liu, RL Ma, X Zhang… - Nature …, 2022‏ - nature.com
Operation speed and coherence time are two core measures for the viability of a qubit.
Strong spin-orbit interaction (SOI) and relatively weak hyperfine interaction make holes in …

Hole Spin Qubits in FinFETs With Fully Tunable Spin-Orbit Coupling and Sweet Spots for Charge Noise

S Bosco, B Hetényi, D Loss - PRX Quantum, 2021‏ - APS
The strong spin-orbit coupling in hole spin qubits enables fast and electrically tunable gates,
but at the same time enhances the susceptibility of the qubit to charge noise. Suppressing …

Recent advances in hole-spin qubits

Y Fang, P Philippopoulos, D Culcer… - Materials for …, 2023‏ - iopscience.iop.org
In recent years, hole-spin qubits based on semiconductor quantum dots have advanced at a
rapid pace. We first review the main potential advantages of these hole-spin qubits with …

Strong spin-orbit interaction and -factor renormalization of hole spins in Ge/Si nanowire quantum dots

FNM Froning, MJ Rančić, B Hetényi, S Bosco… - Physical Review …, 2021‏ - APS
The spin-orbit interaction lies at the heart of quantum computation with spin qubits, research
on topologically nontrivial states, and various applications in spintronics. Hole spins in Ge/Si …

Direct Rashba spin-orbit interaction in Si and Ge nanowires with different growth directions

C Kloeffel, MJ Rančić, D Loss - Physical Review B, 2018‏ - APS
We study theoretically the low-energy hole states in Si, Ge, and Ge/Si core/shell nanowires
(NWs). The NW core in our model has a rectangular cross section, the results for a square …

Controlling spin-orbit interactions in silicon quantum dots using magnetic field direction

T Tanttu, B Hensen, KW Chan, CH Yang, WW Huang… - Physical Review X, 2019‏ - APS
Silicon quantum dots are considered an excellent platform for spin qubits, partly due to their
weak spin-orbit interaction. However, the sharp interfaces in the heterostructures induce a …