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.

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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