Light-Hole Gate-Defined Spin-Orbit Qubit

Abstract

The selective confinement of light-holes (LHs) is demonstrated by introducing a low-dimensional system consisting of highly tensile-strained Ge quantum well enabling the design of an ultrafast gate-defined spin qubit under the electric dipole spin resonance. The qubit size-dependent $g$-factor and dipole moment are mapped, and the parameters inducing their modulation are discussed. It is found that the LH qubit dipole moment is 2 to 3 orders of magnitude higher than that of the canonical heavy-hole qubit. This behavior originates from the significant spin splitting resulting from the combined action of large cubic and linear Rashba spin-orbit interactions that are peculiar to LHs. The qubit relaxation rate is also affected by the strong spin-orbit interaction and follows typically a $B^7$ behavior. The proposed all-group IV, direct bandgap LH qubit provides an effective platform for a scalable qubit-optical photon interface sought-after for long-range entanglement distribution and quantum networks.

References in corpus (28)

• A four-qubit germanium quantum processor
• The germanium quantum information route
• Qubits made by advanced semiconductor manufacturing
• Spin relaxation and decoherence of holes in quantum dots
• Fast two-qubit logic with holes in germanium
• Ge hole spin qubit
• A single-hole spin qubit
• Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots
• Monolithic Infrared Silicon Photonics: The Rise of (Si)GeSn Semiconductors
• Hole spin dephasing time associated to hyperfine interaction in quantum dots
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Cubic Rashba spin-orbit interaction of two-dimensional hole gas in strained-Ge/SiGe quantum well
• Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
• A spin-coherent semiconductor photo-detector for quantum communication
• Theory of Hole-Spin Qubits in Strained Germanium Quantum Dots
• Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
• Large, tunable valley splitting and single-spin relaxation mechanisms in a Si/Si${}_x$Ge${}_{1-x}$ quantum dot
• Dynamics of hole singlet triplet qubits with large g-factor differences
• Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot
• Single-shot readout of hole spins in Ge
• Spin relaxation benchmarks and individual qubit addressability for holes in quantum dots
• Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation
• First-principles hyperfine tensors for electrons and holes in GaAs and silicon
• Hole-phonon interactions in quantum dots: Effects of phonon confinement and encapsulation materials on spin-orbit qubits
• Hyperfine interaction for holes in quantum dots: k.p model
• Exporting superconductivity across the gap: Proximity effect for semiconductor valence-band states due to contact with a simple-metal superconductor
• Vanishing Zeeman energy in a two-dimensional hole gas
• Spin qubit manipulation of acceptor bound states in group IV quantum wells

Cited by in corpus (8)

• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Geometry of the dephasing sweet spots of spin-orbit qubits
• Nuclear Spin-Depleted, Isotopically Enriched 70Ge/28Si70Ge Quantum Wells
• Light-hole spin confined in germanium
• A spinless spin qubit
• Cancelling second order frequency shifts in Ge hole spin qubits via bichromatic control
• Heavy-hole spin relaxation in quantum dots: Isotropic versus anisotropic effects
• The toric code under antiferromagnetic isotropic Heisenberg interactions