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Simulation of the coupling strength of capacitively coupled singlet-triplet qubits

TitleSimulation of the coupling strength of capacitively coupled singlet-triplet qubits
Publication TypeJournal Article
Year of Publication2019
AuthorsD. Buterakos, R. E. Throckmorton, and S. Das Sarma
JournalPhys. Rev. B
Volume100
Pagination075411
Date PublishedAUG 6
Type of ArticleArticle
ISSN2469-9950
Abstract

We consider a system of two purely capacitively coupled singlet-triplet qubits and numerically simulate the energy structure of four electrons in two double quantum dots with a large potential barrier between them. We calculate the interqubit coupling strength using an extended Hund-Mulliken approach which includes excited orbitals in addition to the lowest-energy orbital for each quantum dot. We show the coupling strength as a function of the qubit separation as well as plotting it against the detunings of the two double quantum dots and show that the general qualitative features of our results can be captured by a potential-independent toy model of the system.

DOI10.1103/PhysRevB.100.075411