Coherence characteristics of a GaAs single heavy-hole spin qubit using a modified single-shot latching readout technique

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DOI	Resolve DOI: https://doi.org/10.3390/nano13050950
Author	Search for: Marton, Victor¹ORCID identifier: https://orcid.org/0000-0003-4759-4363; Search for: Sachrajda, Andrew¹; Search for: Korkusinski, Marek¹; Search for: Bogan, Alex¹; Search for: Studenikin, Sergei¹ORCID identifier: https://orcid.org/0000-0002-7712-7187
Affiliation	National Research Council Canada. Security and Disruptive Technologies
Format	Text, Article
Subject	spin qubit; single hole; spin readout; Rabi oscillations; Ramsey; GaAs
Abstract	We present an experimental study of the coherence properties of a single heavy-hole spin qubit formed in one quantum dot of a gated GaAs/AlGaAs double quantum dot device. We use a modified spin-readout latching technique in which the second quantum dot serves both as an auxiliary element for a fast spin-dependent readout within a 200 ns time window and as a register for storing the spin-state information. To manipulate the single-spin qubit, we apply sequences of microwave bursts of various amplitudes and durations to make Rabi, Ramsey, Hahn-echo, and CPMG measurements. As a result of the qubit manipulation protocols combined with the latching spin readout, we determine and discuss the achieved qubit coherence times: 𝑇1, 𝑇𝑅𝑎𝑏𝑖, 𝑇*₂, and 𝑇𝐶𝑃𝑀𝐺₂ vs. microwave excitation amplitude, detuning, and additional relevant parameters.
Publication date	2023-03-06
Publisher	MDPI
Licence	Creative Commons, Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
In	Nanomaterials 13, no. 5, 950 (6 March 2023): 1–11.
Language	English
Peer reviewed	Yes
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Record identifier	dbf72d28-48d2-4885-ab8b-f917b7992198
Record created	2023-08-02
Record modified	2023-08-02

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Date modified:: 2026-03-08