A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission

Dirk Heinze, Dominik Breddermann, Artur Zrenner and Stefan Schumacher ()
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Dirk Heinze: Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn
Dominik Breddermann: Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn
Artur Zrenner: Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn
Stefan Schumacher: Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Sources of single photons are key elements for applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their integrability in semiconductor on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon is emitted from a single-exciton ground state. Polarization of the photon and time of emission are either probabilistic or pre-determined by electronic properties of the system. Here, we study the direct two-photon emission from the biexciton. The two-photon emission is enabled by a laser pulse driving the system into a virtual state inside the band gap. From this intermediate state, the single photon of interest is then spontaneously emitted. We show that emission through this higher-order transition provides a versatile approach to generate a single photon. Through the driving laser pulse, polarization state, frequency and emission time of the photon can be controlled on-the-fly.

Date: 2015
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DOI: 10.1038/ncomms9473

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