# A single-hole spin qubit

@article{Hendrickx2020ASS,
title={A single-hole spin qubit},
author={Nico W Hendrickx and W. I. L. Lawrie and L. Petit and Amir Sammak and Giordano Scappucci and Menno Veldhorst},
journal={Nature Communications},
year={2020},
volume={11}
}
Qubits based on quantum dots have excellent prospects for scalable quantum technology due to their compatibility with standard semiconductor manufacturing. While early research focused on the simpler electron system, recent demonstrations using multi-hole quantum dots illustrated the favourable properties holes can offer for fast and scalable quantum control. Here, we establish a single-hole spin qubit in germanium and demonstrate the integration of single-shot readout and quantum control. We… Expand

#### Figures and Topics from this paper

Single-hole physics in GaAs/AlGaAs double quantum dot system with strong spin–orbit interaction
There is rapidly expanding interest in exploiting the spin of valence-band holes rather than conduction-band electrons for spin qubit semiconductor circuits composed of coupled quantum dots. The holeExpand
A four-qubit germanium quantum processor.
A four-qubit quantum processor based on hole spins in germanium quantum dots is demonstrated and coherent evolution is obtained by incorporating dynamical decoupling, a step towards quantum error correction and quantum simulation using quantum dots. Expand
A spin qubit in a fin field-effect transistor
• Physics
• 2021
Quantum computing’s greatest challenge is scaling up. Several decades ago, classical computers faced the same problem and a single solution emerged: very-large-scale integration using silicon.Expand
All-electrical control of hole singlet-triplet spin qubits at low-leakage points
• Physics
• Physical Review B
• 2021
We study the effect of the spin-orbit interaction on heavy holes confined in a double quantum dot in the presence of a magnetic field of arbitrary direction. Rich physics arise as the two hole statesExpand
Anisotropic g-Factor and Spin-Orbit Field in a Germanium Hut Wire Double Quantum Dot.
• Ting Zhang, +9 authors G. Guo
• Physics, Medicine
• Nano letters
• 2021
From the strongly anisotropic leakage current in the spin blockade regime for a double dot, the full g-tensor is extracted and indicates a strong spin-orbit interaction along the nanowire, which may have originated from the interface inversion asymmetry in Ge hut wires. Expand
Charge detection of a quantum dot under different tunneling barrier symmetries and bias voltages
We report on the realization of a coupled quantum dot (QD) system containing two single QDs made in two adjacent InAs nanowires. One QD (sensor QD) is used as a charge sensor to detect the chargeExpand
Crystalline materials for quantum computing: Semiconductor heterostructures and topological insulators exemplars
• G. Scappucci, P. J. Taylor, J. R. Williams
• Physics
• MRS Bulletin
• 2021
High-purity crystalline solid-state materials play an essential role in various technologies for quantum information processing, from qubits based on spins to topological states. New and improvedExpand
Dispersively Probed Microwave Spectroscopy of a Silicon Hole Double Quantum Dot
Owing to ever increasing gate fidelities and to a potential transferability to industrial CMOS technology, silicon spin qubits have become a compelling option in the strive for quantum computation.Expand
Dynamics of hole singlet triplet qubits with large g-factor differences
Daniel Jirovec1,∗ Philipp M. Mutter2,† Andrea Hofmann, Josip Kukucka, Alessandro Crippa, Frederico Martins, Andrea Ballabio, Daniel Chrastina, Giovanni Isella, Guido Burkard, and Georgios KatsarosExpand
Effective out-of-plane g-factor in strained-Ge/SiGe quantum dots
Recently, lithographic quantum dots in strained-Ge/SiGe have become a promising candidate for quantum computation, with a remarkably quick progression from demonstration of a quantum dot to qubitExpand

#### References

SHOWING 1-10 OF 97 REFERENCES
and M
• Veldhorst, arXiv:1904.11443 [cond-mat]
• 2019
Theory of hole-spin qubits in strained germanium quantum dots
We theoretically investigate the properties of holes in a Si$_{x}$Ge$_{1-x}$/Ge/ Si$_{x}$Ge$_{1-x}$ quantum well in a perpendicular magnetic field that make them advantageous as qubits, including aExpand
Fast two-qubit logic with holes in germanium
• Physics, Medicine
• Nature
• 2020
Planar germanium has thus matured within a year from a material that can host quantum dots to a platform enabling two-qubit logic, positioning itself as an excellent material for use in quantum information applications. Expand
The germanium quantum information route
In the effort to develop disruptive quantum technologies, germanium is emerging as a versatile material to realize devices capable of encoding, processing and transmitting quantum information. TheseExpand
Advanced Functional Materials 29
• 1807613
• 2019
Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
We fabricate Josephson field-effect transistors in germanium quantum wells contacted by superconducting aluminum and demonstrate supercurrents carried by holes that extend over junction lengths ofExpand
Communications Physics 2
• 1
• 2019
Fidelity benchmarks for two-qubit gates in silicon
Two-qubit logic gates in a silicon-based system are shown (using randomized benchmarking) to have high gate fidelities of operation and are used to generate Bell states, a step towards solid-state quantum computation. Expand
Germanium Quantum-Well Josephson Field-Effect Transistors and Interferometers.
A SiGe/Ge/SiGe quantum-well heterostructure hosting high-mobility two-dimensional holes and aluminum superconducting leads is combined to realize prototypical hybrid devices, such as Josephson field-effect transistors (JoFETs) and superconductor quantum interference devices (SQUIDs). Expand
Light effective hole mass in undoped Ge/SiGe quantum wells
We report density-dependent effective hole mass measurements in undoped germanium quantum wells. We are able to span a large range of densities ($2.0-11\times10^{11}$ cm$^{-2}$) in top-gated fieldExpand