Full control of quadruple quantum dot circuit charge states in the single electron regime

M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. D. Watson, M. J. Manfra, S. Tarucha

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We report the realization of an array of four tunnel coupled quantum dots in the single electron regime, which is the first required step toward a scalable solid state spin qubit architecture. We achieve an efficient tunability of the system but also find out that the conditions to realize spin blockade readout are not as straightforwardly obtained as for double and triple quantum dot circuits. We use a simple capacitive model of the series quadruple quantum dots circuit to investigate its complex charge state diagrams and are able to find the most suitable configurations for future Pauli spin blockade measurements. We then experimentally realize the corresponding charge states with a good agreement to our model.

Original languageEnglish
Article number183111
JournalApplied Physics Letters
Volume104
Issue number18
DOIs
Publication statusPublished - 2014 May 5
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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