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Electron cascade for distant spin readout.

Abstract：

:The spin of a single electron in a semiconductor quantum dot provides a well-controlled and long-lived qubit implementation. The electron charge in turn allows control of the position of individual electrons in a quantum dot array, and enables charge sensors to probe the charge configuration. Here we show that the Coulomb repulsion allows an initial charge transition to induce subsequent charge transitions, inducing a cascade of electron hops, like toppling dominoes. A cascade can transmit information along a quantum dot array over a distance that extends by far the effect of the direct Coulomb repulsion. We demonstrate that a cascade of electrons can be combined with Pauli spin blockade to read out distant spins and show results with potential for high fidelity using a remote charge sensor in a quadruple quantum dot device. We implement and analyse several operating modes for cascades and analyse their scaling behaviour. We also discuss the application of cascade-based spin readout to densely-packed two-dimensional quantum dot arrays with charge sensors placed at the periphery. The high connectivity of such arrays greatly improves the capabilities of quantum dot systems for quantum computation and simulation.

journal_name

Nat Commun

journal_title

Nature communications

authors

van Diepen CJ,Hsiao TK,Mukhopadhyay U,Reichl C,Wegscheider W,Vandersypen LMK

doi

10.1038/s41467-020-20388-6

subject

Has Abstract

pub_date

2021-01-04 00:00:00

pages

77

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20388-6

journal_volume

12

pub_type

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