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Ultrafast high-fidelity initialization of a quantum-dot spin qubit without magnetic fields

Lookup NU author(s): Dr Jonathan Mar



This is the of an article that has been published in its final definitive form by American Physical Society, 2014.

For re-use rights please refer to the publisher's terms and conditions.


We demonstrate the initialization of a single quantum-dot hole spin with high fidelity (lower bound >97%), on picosecond time scales, and without the need for magnetic fields. Using the initialization scheme based on rapid electric-field ionization of a resonantly excited exciton, this is achieved by employing a self-assembled quantum dot with a low conduction-to-valence band offset ratio, allowing control of the relative electron and hole tunneling rates over three orders of magnitude. This large difference in tunneling rates could permit spin-storage efficiencies >99.5% by fast-switching to a low electric-field condition. Our results may provide a practical route towards ultrafast high-fidelity initialization of individual quantum-dot hole spins for the implementation of quantum error correction in a scalable spin-based quantum computer.

Publication metadata

Author(s): Mar JD, Baumberg JJ, Xu XL, Irvine AC, Williams DA

Publication type: Article

Publication status: Published

Journal: Physical Review B (Rapid Communications)

Year: 2014

Volume: 90

Online publication date: 15/12/2014

Acceptance date: 15/12/2014

Date deposited: 15/06/2020

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society


DOI: 10.1103/PhysRevB.90.241303


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