Ultrafast sequential charge transfer in a double quantum dot

A. Putaja, E. Räsänen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)


We use optimal control theory to construct external electric fields that coherently transfer the electronic charge in a double quantum-dot system. Without truncation of the eigenstates we operate on desired superpositions of the states in order to prepare the system to a localized state and to coherently transfer the charge from one well to another. Within a fixed time interval, the optimal processes are shown to occur through several excited states. The obtained yields are generally between 99% and 99.99% depending on the field constraints, and they are not dramatically affected by strict frequency filters which make the fields (e.g., laser pulses) closer to experimental realism. Finally we demonstrate that our scheme provides simple access to hundreds of sequential processes in charge localization while preserving the high fidelity.

Original languageEnglish
Article number165336
Number of pages6
JournalPhysical Review B
Issue number16
Publication statusPublished - 29 Oct 2010
Externally publishedYes
Publication typeA1 Journal article-refereed


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