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

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 bloc...

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Bibliographic Details
Published in:Applied physics letters 2014-05, Vol.104 (18)
Main Authors: Delbecq, M. R., Nakajima, T., Otsuka, T., Amaha, S., Watson, J. D., Manfra, M. J., Tarucha, S.
Format: Article
Language:English
Subjects:
Applied physics
CHARGE STATES
ELECTRONS
MATERIALS SCIENCE
QUANTUM DOTS
Qubits (quantum computing)
SPIN
State (computer science)
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4875909