Time-bin entangled photon pairs from quantum dots embedded in a self-aligned cavity

Laia Gines, Carlo Pepe, Junior Gonzales, Niels Gregersen, Sven Hofling, Christian Schneider, Ana Predojevic*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    We introduce a scalable photonic platform that enables efficient generation of entangled photon pairs from a semiconductor quantum dot. Our system, which is based on a self-aligned quantum dot- micro-cavity structure, erases the need for complex steps of lithography and nanofabrication. We experimentally show collection efficiency of 0.17 combined with a Purcell enhancement of up to 1.7. We harness the potential of our device to generate photon pairs entangled in time bin, reaching a fidelity of 0.84(5) with the maximally entangled state. The achieved pair collection efficiency is 4 times larger than the state-of-the art for this application. The device, which theoretically supports pair extraction efficiencies of nearly 0.5 is a promising candidate for the implementation of bright sources of time-bin, polarization- and hyper entangled photon pairs in a straightforward manner.

    Original languageEnglish
    JournalOptics Express
    Issue number3
    Pages (from-to)4174-4180
    Publication statusPublished - 1 Feb 2021


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