UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Charge dynamics and spin blockade in a hybrid double quantum dot in silicon

Urdampilleta, M; Chatterjee, A; Lo, CC; Kobayashi, T; Mansir, J; Barraud, S; Betz, AC; ... Morton, JJL; + view all (2015) Charge dynamics and spin blockade in a hybrid double quantum dot in silicon. Physical Review X , 5 (3) , Article 031024. 10.1103/PhysRevX.5.031024. Green open access

[img]
Preview
Text
PhysRevX.5.031024.pdf

Download (452kB) | Preview

Abstract

Electron spin qubits in silicon, whether in quantum dots or in donor atoms, have long been considered attractive qubits for the implementation of a quantum computer because of silicon’s “semiconductor vacuum” character and its compatibility with the microelectronics industry. While donor electron spins in silicon provide extremely long coherence times and access to the nuclear spin via the hyperfine interaction, quantum dots have the complementary advantages of fast electrical operations, tunability, and scalability. Here, we present an approach to a novel hybrid double quantum dot by coupling a donor to a lithographically patterned artificial atom. Using gate-based rf reflectometry, we probe the charge stability of this double quantum-dot system and the variation of quantum capacitance at the interdot charge transition. Using microwave spectroscopy, we find a tunnel coupling of 2.7 GHz and characterize the charge dynamics, which reveals a charge T2 of 200 ps and a relaxation time T1 of 100 ns. Additionally, we demonstrate a spin blockade at the inderdot transition, opening up the possibility to operate this coupled system as a singlet-triplet qubit or to transfer a coherent spin state between the quantum dot and the donor electron and nucleus.

Type: Article
Title: Charge dynamics and spin blockade in a hybrid double quantum dot in silicon
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevX.5.031024
Publisher version: http://dx.doi.org/10.1103/PhysRevX.5.031024
Additional information: Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1466917
Downloads since deposit
68Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item