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We report the first measurement of the characteristic relaxation times of spin and valley states, obtained in a high-quality Bilayer graphene (BLG) device containing gate-defined double quantum dots. We show that valley states can be distinguished with a fidelity of well above 99 % and report remarkably long singlet–triplet intervalley relaxation times, exceeding 500ms at B = 250mT, more than one order of magnitude longer than the relaxation times we measure for spin states. Our approach to isolating valley states paves the way to measuring coherent valley-qubit oscillations and, in combination with the recently demonstrated electrical tunability of the valley g-factor, could provide a practical platform for the electrical control of long-lived valley qubits in BLG.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Bilayer graphene, valley qubits, relaxation time

Date published: 2024-01-17

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Physics (ISSN: 17452481) vol. 20 issue. 3 p. 428-434

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41567-023-02334-7

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Updated at: 2025-02-23 22:48:19 +0900

Published on MDR: 2025-02-23 22:48:20 +0900