Fast two-qubit logic with holes in germanium

The promise of quantum computation with quantum dots has stimulated widespread research. Still, a platform that can combine excellent control with fast and high-fidelity operation is absent. Here, we show single and two-qubit operations based on holes in germanium. A high degree of control over the...

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Bibliographic Details
Published in:arXiv.org 2019-04
Main Authors: Hendrickx, N W, Franke, D P, Sammak, A, Scappucci, G, Veldhorst, M
Format: Article
Language:English
Subjects:
Quantum computing
Quantum dots
Quantum phenomena
Quantum theory
Quantum wells
Qubits (quantum computing)
Spin-orbit interactions
Online Access:Get full text
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Summary:The promise of quantum computation with quantum dots has stimulated widespread research. Still, a platform that can combine excellent control with fast and high-fidelity operation is absent. Here, we show single and two-qubit operations based on holes in germanium. A high degree of control over the tunnel coupling and detuning is obtained by exploiting quantum wells with very low disorder and by working in a virtual gate space. Spin-orbit coupling obviates the need for microscopic elements and enables rapid qubit control with Rabi frequencies exceeding 100 MHz and a single-qubit fidelity of 99.3 %. We demonstrate fast two-qubit CX gates executed within 75 ns and minimize decoherence by operating at the charge symmetry point. Planar germanium thus matured within one year from a material that can host quantum dots to a platform enabling two-qubit logic, positioning itself as a unique material to scale up spin qubits for quantum information.
ISSN:2331-8422
DOI:10.48550/arxiv.1904.11443