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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Quantum dots, spin qubits, bilayer graphene

刊行年月日: 2022-05-26

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/prxquantum.3.020343

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更新時刻: 2025-02-28 16:30:47 +0900

MDRでの公開時刻: 2025-02-28 16:30:47 +0900