Isotopically Enhanced Triple-quantum-dot Qubit

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2015 Nov 25

PMID 26601186

Citations 25

Authors

Kevin Eng

Thaddeus D Ladd

Aaron Smith

Matthew G Borselli

Andrey A Kiselev

Bryan H Fong

Kevin S Holabird

Thomas M Hazard

Biqin Huang

Peter W Deelman

Ivan Milosavljevic

Adele E Schmitz

Richard S Ross

Mark F Gyure

Andrew T Hunter

Affiliations

Soon will be listed here.

Abstract

Like modern microprocessors today, future processors of quantum information may be implemented using all-electrical control of silicon-based devices. A semiconductor spin qubit may be controlled without the use of magnetic fields by using three electrons in three tunnel-coupled quantum dots. Triple dots have previously been implemented in GaAs, but this material suffers from intrinsic nuclear magnetic noise. Reduction of this noise is possible by fabricating devices using isotopically purified silicon. We demonstrate universal coherent control of a triple-quantum-dot qubit implemented in an isotopically enhanced Si/SiGe heterostructure. Composite pulses are used to implement spin-echo type sequences, and differential charge sensing enables single-shot state readout. These experiments demonstrate sufficient control with sufficiently low noise to enable the long pulse sequences required for exchange-only two-qubit logic and randomized benchmarking.

Citing Articles

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