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Electrical control of quantum-dot fine-structure splitting for high-fidelity hole spin initialization

Lookup NU author(s): Dr Jonathan Mar

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This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2016.

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Abstract

We demonstrate electrical control of the neutral exciton fine-structure splitting in a single InAs/GaAs self-assembled quantum dot by significantly reducing the splitting to near zero through the application of a vertical electric field in the fast electron tunneling regime. This is verified by performing high-resolution photocurrent spectroscopy of the two fine-structure split exciton eigenstates as a function of reverse bias voltage. Using the qubit initialization scheme for a quantum-dot hole spin based on rapid electric-field ionization of a spin-polarized exciton, our results suggest a practical approach towards achieving qubit initialization with near-unity fidelity in the absence of magnetic fields.

Publication metadata

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

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2016

Volume: 93

Online publication date: 27/01/2016

Acceptance date: 27/01/2016

Date deposited: 15/06/2020

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevB.93.045316

DOI: 10.1103/PhysRevB.93.045316

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