Modelling of planar germanium hole qubits in electric and magnetic fields
arXiv:2208.04795 · doi:10.1038/s41534-024-00897-8
Abstract
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 interaction in this structure allows for efficient qubit operations with electric fields. However, it also couples the qubit to electrical noise. In this work, we perform simulations of a heterostructure hosting these hole spin qubits. We solve the effective mass equations for a realistic heterostructure, provide a set of analytical basis wave functions, and compute the effective g-factor of the heavy-hole ground-state. Our investigations reveal a strong impact of highly excited light-hole states located outside the quantum well on the g-factor. We find that sweet spots, points of operations that are least susceptible to charge noise, for out-of-plane magnetic fields are shifted to impractically large electric fields. However, for magnetic fields close to in-plane alignment, partial sweet spots at low electric fields are recovered. Furthermore, sweet spots with respect to multiple fluctuating charge traps can be found under certain circumstances for different magnetic field alignments. This work will be helpful in understanding and improving coherence of germanium hole spin qubits.
arXiv comment11 pages, 6 Figures
References in corpus (40)
- Decoherence in a superconducting quantum bit circuit
- Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
- 1/f noise: implications for solid-state quantum information
- Computing with spin qubits at the surface code error threshold
- A four-qubit germanium quantum processor
- The germanium quantum information route
- Fast two-qubit logic with holes in germanium
- Ge hole spin qubit
- Review of performance metrics of spin qubits in gated semiconducting nanostructures
- Gate-controlled quantum dots and superconductivity in planar germanium
- Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
- Theory of Hole-Spin Qubits in Strained Germanium Quantum Dots
- A single hole spin with enhanced coherence in natural silicon
- Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
- Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
- Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
- Strong spin-orbit interaction and -factor renormalization of hole spins in Ge/Si nanowire quantum dots
- Reducing charge noise in quantum dots by using thin silicon quantum wells
- Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
- Light effective hole mass in undoped Ge/SiGe quantum wells
- Dynamics of hole singlet triplet qubits with large g-factor differences
- Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
- Hole spin driving by strain-induced spin-orbit interactions
- Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation
- Lightly-strained germanium quantum wells with hole mobility exceeding one million
- Hole Spin Qubits in Ge Nanowire Quantum Dots: Interplay of Orbital Magnetic Field, Strain, and Growth Direction
- Hole spin manipulation in inhomogeneous and non-separable electric fields
- The asymmetric resonant exchange qubit under the influence of electrical noise
- Modelling semiconductor spin qubits and their charge noise environment for quantum gate fidelity estimation
- Longitudinal and transverse electric field manipulation of hole spin-orbit qubits in one-dimensional channels
- Electromagnetic control of valley splitting in ideal and disordered Si quantum dots
- Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
- Hole spin qubits in thin curved quantum wells
- Spectroscopy of Quantum-Dot Orbitals with In-Plane Magnetic Fields
- Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot
- Geometry of the dephasing sweet spots of spin-orbit qubits
- Simulation of 1/f charge noise affecting a quantum dot in a Si/SiGe structure
- G-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field
- Vanishing Zeeman energy in a two-dimensional hole gas
- Exchange anisotropies in microwave-driven singlet-triplet qubits