Journal article

Engineering long spin coherence times of spin-orbit qubits in silicon

Takashi Kobayashi, Joseph Salfi, Cassandra Chua, Joost van der Heijden, Matthew G House, Dimitrie Culcer, Wayne D Hutchison, Brett C Johnson, Jeff C McCallum, Helge Riemann, Nikolay Abrosimov, Peter Becker, Hans-Joachim Pohl, Michelle Y Simmons, Sven Rogge

Nature Materials | NATURE PUBLISHING GROUP | Published : 2020

Abstract

Electron-spin qubits have long coherence times suitable for quantum technologies. Spin-orbit coupling promises to greatly improve spin qubit scalability and functionality, allowing qubit coupling via photons, phonons or mutual capacitances, and enabling the realization of engineered hybrid and topological quantum systems. However, despite much recent interest, results to date have yielded short coherence times (from 0.1 to 1 μs). Here we demonstrate ultra-long coherence times of 10 ms for holes where spin-orbit coupling yields quantized total angular momentum. We focus on holes bound to boron acceptors in bulk silicon 28, whose wavefunction symmetry can be controlled through crystal strain, ..

View full abstract

University of Melbourne Researchers

Grants

Awarded by ARC Centre of Excellence for Quantum Computation and Communication Technology


Awarded by US Army Research Office


Awarded by ARC DECRA fellowship


Funding Acknowledgements

This work was supported by the ARC Centre of Excellence for Quantum Computation and Communication Technology (CE170100012), in part by the US Army Research Office (W911NF-08-1-0527). T.K. acknowledges support from the Tohoku University Graduate Program in Spintronics. J.S. acknowledges support from an ARC DECRA fellowship (DE160101490). M.Y.S. acknowledges a Laureate Fellowship. We thank M. Thewalt for the 28Si sample.