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Dephasing Free Photon Entanglement with a Quantum Dot
Delft Univ Technol, Kavli Inst Nanosci Delft, NL-2628 CJ Delft, Netherlands. hmadi, A..
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2019 (English)In: ACS Photonics, E-ISSN 2330-4022, Vol. 6, no 7, p. 1656-1663Article in journal (Refereed) Published
Abstract [en]

Generation of photon pairs from quantum dots with near-unity entanglement fidelity has been a long-standing scientific challenge. It is generally thought that the nuclear spins limit the entanglement fidelity through spin flip dephasing processes. However, this assumption lacks experimental support. Here, we show two-photon entanglement with negligible dephasing from an indium rich single quantum dot comprising a nuclear spin of 9/2 when excited quasi-resonantly. This finding is based on a significantly close match between our entanglement measurements and our model that assumes no dephasing and takes into account the detection system's timing jitter and dark counts. We suggest that neglecting the detection system is responsible for the degradation of the measured entanglement fidelity in the past and not the nuclear spins. Therefore, the key to unity entanglement from quantum dots comprises a resonant excitation scheme and a detection system with ultralow timing jitter and dark counts.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 6, no 7, p. 1656-1663
Keywords [en]
entanglement, fine-structure splitting, quantum dot, single photons
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-255771DOI: 10.1021/acsphotonics.8b01496ISI: 000476684300012Scopus ID: 2-s2.0-85067950170OAI: oai:DiVA.org:kth-255771DiVA, id: diva2:1341870
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QC 20190812

Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Jöns, Klaus D.Zwiller, Val

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