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Universal fine-structure eraser for quantum dots
Delft Univ Technol, Kavli Inst Nanosci Delft, NL-2628 CJ Delft, Netherlands..
Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada.;Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada..
Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada.;Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada..
Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada.;Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada..
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2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 19, p. 24487-24496Article in journal (Refereed) Published
Abstract [en]

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. 

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2018. Vol. 26, no 19, p. 24487-24496
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Physical Sciences
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URN: urn:nbn:se:kth:diva-235579DOI: 10.1364/OE.26.024487ISI: 000444705000016Scopus ID: 2-s2.0-85053389089OAI: oai:DiVA.org:kth-235579DiVA, id: diva2:1252214
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QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved

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