Universal fine-structure eraser for quantum dots

A. Fognini, A. Ahmadi, S. J. Daley, M. E. Reimer, V. Zwiller

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    We analyze the degree of entanglement measurable from a quantum dot via the biexciton-exciton cascade as a function of the exciton fine-structure splitting and the detection time resolution. We show that the time-energy uncertainty relation provides means to measure a high entanglement even in presence of a finite fine-structure splitting when a detection system with high temporal resolution is employed. Still, in many applications it would be beneficial if the fine-structure splitting could be compensated to zero. To solve this problem, we propose an all-optical approach with rotating waveplates to erase this fine-structure splitting completely which should allow obtaining a high degree of entanglement with near-unity efficiency. Our optical approach is possible with current technology and is also compatible with any quantum dot showing fine-structure splitting. This bears the advantage that for example the fine-structure splitting of quantum dots in nanowires and micropillars can be directly compensated without the need for further sample processing.

    Original languageEnglish
    Pages (from-to)24487-24496
    Number of pages10
    JournalOptics Express
    Issue number19
    Publication statusPublished - 2018

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    Fognini, A., Ahmadi, A., Daley, S. J., Reimer, M. E., & Zwiller, V. (2018). Universal fine-structure eraser for quantum dots. Optics Express, 26(19), 24487-24496. https://doi.org/10.1364/OE.26.024487