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Gate-reflectometry dispersive readout and coherent control of a spin qubit in silicon.

ABSTRACT: Silicon spin qubits have emerged as a promising path to large-scale quantum processors. In this prospect, the development of scalable qubit readout schemes involving a minimal device overhead is a compelling step. Here we report the implementation of gate-coupled rf reflectometry for the dispersive readout of a fully functional spin qubit device. We use a p-type double-gate transistor made using industry-standard silicon technology. The first gate confines a hole quantum dot encoding the spin qubit, the second one a helper dot enabling readout. The qubit state is measured through the phase response of a lumped-element resonator to spin-selective interdot tunneling. The demonstrated qubit readout scheme requires no coupling to a Fermi reservoir, thereby offering a compact and potentially scalable solution whose operation may be extended above 1 K.

SUBMITTER: Crippa A

PROVIDER: S-EPMC6610084 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Gate-reflectometry dispersive readout and coherent control of a spin qubit in silicon.

Crippa A A Ezzouch R R Aprá A A Amisse A A Laviéville R R Hutin L L Bertrand B B Vinet M M Urdampilleta M M Meunier T T Sanquer M M Jehl X X Maurand R R De Franceschi S S

Nature communications 20190703 1

Silicon spin qubits have emerged as a promising path to large-scale quantum processors. In this prospect, the development of scalable qubit readout schemes involving a minimal device overhead is a compelling step. Here we report the implementation of gate-coupled rf reflectometry for the dispersive readout of a fully functional spin qubit device. We use a p-type double-gate transistor made using industry-standard silicon technology. The first gate confines a hole quantum dot encoding the spin qu ...[more]

PMID: 31270319

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