Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power

Abstract

Hole spin qubits in planar Ge heterostructures are one of the frontrunner platforms for scalable quantum computers. In these systems, the spin-orbit interactions permit efficient all-electric qubit control. We propose a minimal design modification of planar devices that enhances these interactions by orders of magnitude and enables low power ultrafast qubit operations in the GHz range. Our approach is based on an asymmetric potential that strongly squeezes the quantum dot in one direction. This confinement-induced spin-orbit interaction does not rely on microscopic details of the device such as growth direction or strain, and could be turned on and off on demand in state-of-the-art qubits.

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Cited by in corpus (58)

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• Operating semiconductor quantum processors with hopping spins
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• Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
• On-demand electrical control of spin qubits
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• Quantum computing on magnetic racetracks with flying domain wall qubits
• Two-body Wigner molecularization in asymmetric quantum dot spin qubits
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• Systematic Characterization of Transmon Qubit Stability with Thermal Cycling
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