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Description:

Electrostatically defined quantum dots (QDs) in bilayer graphene offer a promising platform for spin qubits with presumably long coherence times due to low spin-orbit coupling and low nuclear spin density. We demonstrate two different experimental approaches to measure the decay times of excited states. One is based on direct current measurements through the quantum device. Pulse sequences are applied to tuning gates that control the occupation of ground and excited states. Similar to previous experiments we find a lower bound for the excited state decay on the order of a hundred microseconds. The other approach uses a capacitively coupled charge sensor to study the time dynamics of the excited state using Elzerman technique. The long excited state relaxation time allows us to measure the excited state tunneling events. Here we demonstrate single-shot readout, an important step for any quantum information processor.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Quantum dots, spin qubits, bilayer graphene

Date published: 2022-05-26

Publisher: American Physical Society (APS)

Journal:

• PRX Quantum (ISSN: 26913399) vol. 3 issue. 2 020343

Funding:

• Horizon 2020 862660
• NCCR QSIT
• Swiss National Science Foundation 51NF40-185902
• Marie Sklodowska-Curie 766025
• MEXT JPMXP0112101001
• JSPS JP20H00354
• CREST

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

MDR DOI:

First published URL: https://doi.org/10.1103/prxquantum.3.020343

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Updated at: 2025-02-28 16:30:47 +0900

Published on MDR: 2025-02-28 16:30:47 +0900