Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide

Kirsanske, Gabija and Thyrrestrup, Henri and Daveau, Raphael S. and Dreessen, Chris L. and Pregnolato, Tommaso and Midolo, Leonardo and Tighineanu, Petru and Javadi, Alisa and Stobbe, Soren and Schott, Ruediger and Ludwig, Arne and Wieck, Andreas D. and Park, Suk In and Song, Jin D. and Kuhlmann, Andreas V. and Sollner, Immo and Lobl, Matthias C. and Warburton, Richard J. and Lodahl, Peter. (2017) Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide. Physical Review B, 96 (16). p. 165306.

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Official URL: http://edoc.unibas.ch/58237/

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We demonstrate a high-purity source of indistinguishable single photons using a quantum dot embedded in a nanophotonic waveguide. The source features a near-unity internal coupling efficiency and the collected photons are efficiently coupled off chip by implementing a taper that adiabatically couples the photons to an optical fiber. By quasiresonant excitation of the quantum dot, we measure a single-photon purity larger than 99.4% and a photon indistinguishability of up to 94±1% by using p-shell excitation combined with spectral filtering to reduce photon jitter. A temperature-dependent study allows pinpointing the residual decoherence processes, notably the effect of phonon broadening. Strict resonant excitation is implemented as well as another means of suppressing photon jitter, and the additional complexity of suppressing the excitation laser source is addressed. The paper opens a clear pathway towards the long-standing goal of a fully deterministic source of indistinguishable photons, which is integrated on a planar photonic chip.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J and Löbl, Matthias and Söllner, Immo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Jan 2018 11:51
Deposited On:10 Jan 2018 11:51

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