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

Abstract

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 small but significant spin-orbit interaction which degrade the performance of the qubits or, when understood and controlled, could be used as a powerful resource. To understand how to control this interaction we build a detailed profile of the spin-orbit interaction of a silicon metal-oxide-semiconductor double quantum dot system. We probe the derivative of the Stark shift, $g$-factor and $g$-factor difference for two single-electron quantum dot qubits as a function of external magnetic field and find that they are dominated by spin-orbit interactions originating from the vector potential, consistent with recent theoretical predictions. Conversely, by populating the double dot with two electrons we probe the mixing of singlet and spin-polarized triplet states during electron tunneling, which we conclude is dominated by momentum-term spin-orbit interactions that varies from 1.85 MHz up to 27.5 MHz depending on the magnetic field orientation. Finally, we exploit the tunability of the derivative of the Stark shift of one of the dots to reduce its sensitivity to electric noise and observe an 80 % increase in $T_2^{\ast }$. We conclude that the tuning of the spin-orbit interaction will be crucial for scalable quantum computing in silicon and that the optimal setting will depend on the exact mode of qubit operations used.

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• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
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• Electron g-factor of valley states in realistic silicon quantum dots
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• Quantum Computation Protocol for Dressed Spins in a Global Field
• High-fidelity geometric gate for silicon-based spin qubits
• Hotter is easier: unexpected temperature dependence of spin qubit frequencies
• Anisotropic g-Factor and Spin-Orbit Field in a Ge Hut Wire Double Quantum Dot
• Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
• Magnetic Gradient Fluctuations from Quadrupolar ${}^{73}$Ge in Si/SiGe Exchange-Only Qubits
• Controlling Synthetic Spin-Orbit Coupling in a Silicon Quantum Dot with Magnetic Field
• Bounds to electron spin qubit variability for scalable CMOS architectures
• Looped Pipelines Enabling Effective 3D Qubit Lattices in a Strictly 2D Device
• Switching between relaxation hotspots and coldspots in disordered spin qubits
• Remote capacitive sensing in two-dimension quantum-dot arrays
• Spin-Valley Protected Kramers Pair in Bilayer Graphene
• Linear-in-momentum spin orbit interactions in planar Ge/GeSi heterostructures and spin qubits
• A Silicon Surface Code Architecture Resilient Against Leakage Errors
• Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
• G-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field
• Simulation of 1/f charge noise affecting a quantum dot in a Si/SiGe structure
• Compromise-Free Scaling of Qubit Speed and Coherence
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• Two-qubit CZ gates robust against charge noise in silicon while compensating for crosstalk using neural network
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• Robust implementation of quantum gates despite always-on exchange coupling in silicon double quantum dots
• Correlations of spin splitting and orbital fluctuations due to 1/f charge noise in the Si/SiGe Quantum Dot
• Control of dephasing in spin qubits during coherent transport in silicon
• Anisotropy with respect to the applied magnetic field of spin qubit decoherence times
• Impact of electrostatic crosstalk on spin qubits in dense CMOS quantum dot arrays
• Entangling gates on degenerate spin qubits dressed by a global field
• Measurements of anisotropic g-factors for electrons in InSb nanowire quantum dots
• Isotropic and Anisotropic g-factor Corrections in GaAs Quantum Dots
• Hyperfine-assisted decoherence of a phosphorus nuclear-spin qubit in silicon
• Polarimetry With Spins in the Solid State
• Topological charge distributions of an interacting two-spin system
• Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling
• Effective tuning methods for few-electron regime in gate-defined quantum dots
• Steady-state dc transport through an Anderson impurity coupled to leads with spin-orbit coupling
• Enhanced local addressability of a spin array with local exchange pulses and global microwave driving