# Hole-spin qubits in Ge nanowire quantum dots: Interplay of orbital magnetic field, strain, and growth direction

@article{Adelsberger2021HolespinQI, title={Hole-spin qubits in Ge nanowire quantum dots: Interplay of orbital magnetic field, strain, and growth direction}, author={Christoph Adelsberger and M. Benito and S. Bosco and Jelena Klinovaja and Daniel Loss}, journal={Physical Review B}, year={2021} }

Hole spin qubits in quasi one-dimensional structures are a promising platform for quantum information processing because of the strong spin-orbit interaction (SOI). We present analytical results and discuss device designs that optimize the SOI in Ge semiconductors. We show that at the magnetic field values at which qubits are operated, orbital effects of magnetic fields can strongly affect the response of the spin qubit. We study one-dimensional hole systems in Ge under the influence of…

## 11 Citations

### Electrical manipulation of a hole ‘spin’-orbit qubit in nanowire quantum dot: the nontrivial magnetic field effects

- PhysicsChinese Physics B
- 2022

Strong ‘spin’-orbit coupled one-dimensional hole gas is achievable in a Ge nanowire in the presence of a strong magnetic field. The strong magnetic field lifts the two-fold degeneracy in the hole…

### Anomalous Zero-Field Splitting for Hole Spin Qubits in Si and Ge Quantum Dots.

- PhysicsPhysical review letters
- 2022

An anomalous energy splitting of spin triplet states at zero magnetic field has recently been measured in germanium quantum dots. This zero-field splitting could crucially alter the coupling between…

### Modelling of planar germanium hole qubits in electric and magnetic fields

- Physics
- 2022

Hole-based spin qubits in strained planar germanium quantum wells have received considerable attention due to their favourable properties and remarkable experimental progress. The sizeable spin-orbit…

### Hole Spin Qubits in Thin Curved Quantum Wells

- PhysicsPhysical Review Applied
- 2022

Hole spin qubits are frontrunner platforms for scalable quantum computers because of their large spin-orbit interaction which enables ultrafast all-electric qubit control at low power. The fastest…

### Electrical control of the g tensor of the first hole in a silicon MOS quantum dot

- PhysicsPhysical Review B
- 2021

Single holes confined in semiconductor quantum dots are a promising platform for spin qubit technology, due to the electrical tunability of the g-factor of holes. However, the underlying mechanisms…

### Coupled superconducting spin qubits with spin-orbit interaction

- PhysicsPhysical Review B
- 2022

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 approaches to control these…

### Quantum control of hole spin qubits in double quantum dots

- Physics
- 2022

Hole spin qubits in semiconductor quantum dots (QDs) are promising candidates for quantum information processing due to their weak hyperﬁne coupling to nuclear spins, and to the strong spin-orbit…

### Modelling of spin decoherence in a Si hole qubit perturbed by a single charge fluctuator

- Physics
- 2022

Spin qubits in semiconductor quantum dots are one of the promizing devices to realize a quantum processor. A better knowledge of the noise sources aﬀecting the coherence of such a qubit is therefore…

### Two-band description of the strong `spin'-orbit coupled one-dimensional hole gas

- Physics
- 2022

Strong ‘spin’-orbit coupled one-dimensional hole gas is achievable in an unstrained Ge nanowire in the presence of a strong magnetic ﬁeld. Basing on the Luttinger-Kohn Hamiltonian in the spherical…

### Enhanced orbital magnetic field effects in Ge hole nanowires

- Physics
- 2022

Hole semiconductor nanowires (NW) are promising platforms to host spin qubits and Majorana bound states for topological qubits because of their strong spin-orbit interactions (SOI). The properties of…

## References

SHOWING 1-10 OF 72 REFERENCES

### Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits

- Physics
- 2021

Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to…

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

- PhysicsNature communications
- 2022

Rabi oscillations with the record frequency of 540 MHz in a hole-based double quantum dot in a germanium hut wire, which is attributed to strong spin-orbit interaction of heavy holes.

### Decoupling a hole spin qubit from the nuclear spins.

- PhysicsNature materials
- 2016

This work investigates here a single hole spin in an InGaAs quantum dot embedded in a new generation of low-noise p-type device, and measures the hole Zeeman energy in a transverse magnetic field with 10 neV resolution by dark-state spectroscopy as they create a large transverse nuclear spin polarization.

### Hole spin relaxation in Ge-Si core-shell nanowire qubits.

- PhysicsNature nanotechnology
- 2011

State preparation, pulsed gate control and charge-sensing spin readout of hole spins confined in a Ge-Si core-shell nanowire are demonstrated and T(1) spin relaxation times are measured, consistent with a spin-orbit mechanism that is usually masked by hyperfine contributions.

### A singlet-triplet hole spin qubit in planar Ge

- PhysicsNature Materials
- 2021

A hole spin qubit is demonstrated operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge and by encoding the qubit into the singlet-triplet states of a double quantum dot.

### Ge hole spin qubit

- Physics
- 2018

Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate double quantum dot devices in Ge hut wires. Low…

### A single-hole spin qubit

- PhysicsNature Communications
- 2020

A single-hole spin qubit in germanium is established and the integration of single-shot readout and coherent control of a qubit made from a single hole spin is demonstrated, setting the benchmark for hole quantum dot qubits.

### Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot.

- PhysicsNature nanotechnology
- 2014

A long-lived single-electron spin qubit in a Si/SiGe quantum dot with all-electrical two-axis control is demonstrated and advances strongly improve the prospects for quantum information processing based on quantum dots.

### A coherent spin–photon interface in silicon

- PhysicsNature
- 2018

Strong coupling between a single spin in silicon and a single microwave-frequency photon, with spin–photon coupling rates of more than 10 megahertz is demonstrated, which opens up a direct path to entangling single spins using microwave- frequencies.

### Strong and tunable spin--orbit coupling of one-dimensional holes in Ge/Si core/shell nanowires.

- PhysicsNano letters
- 2010

It is shown that the spin--orbit coupling strength can be modulated by more than five folds with an external electric field, and may serve as a candidate for spintronics applications.