Charge-state conditional operation of a spin qubit.

Charge-state conditional operation of a spin qubit.

We report coherent operation of a singlet-triplet qubit controlled by the spatial arrangement of two confined electrons in an adjacent double quantum dot that is electrostatically coupled to the qubit. This four-dot system is the specific device geometry needed for two-qubit operations of a two-elec...

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Bibliographic Details
Main Authors: van Weperen, I, Armstrong, B, Laird, E, Medford, J, Marcus, C, Hanson, M, Gossard, A
Format: Journal article
Language:English
Published: 2011
Description
Summary:We report coherent operation of a singlet-triplet qubit controlled by the spatial arrangement of two confined electrons in an adjacent double quantum dot that is electrostatically coupled to the qubit. This four-dot system is the specific device geometry needed for two-qubit operations of a two-electron spin qubit. We extract the strength of the capacitive coupling between qubit and adjacent double quantum dot and show that the present geometry allows fast conditional gate operation, opening pathways toward implementation of a universal set of gates for singlet-triplet spin qubits.

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