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Integrated Sources of Entangled and Indistinguishable Photons

Schematic view of an array of integrated single photon sources which are resonantly excited by electrically driven microlasers.

In this project we will develop integrated sources of single and entangled photon pairs for applications in the field quantum communcation. Within an on-chip approach electrically pumped whispering gallery mode microlasers will resonantly excite single quantum dots embedded in adjacent micropillar cavities and Bragg-reflection waveguides. By this we will a new level of integration without the need of external light sources. Besides technological challenges, there exist a number of exciting physical questions such as an in-depth understanding of the non-linear processes involved in the generation of entangled photon pairs which will be tackled by our project. Our work will set the ground for a quantum optics platform that could revolutionize the way we conduct quantum optics experiments and may in the long run become a new quantum technology.


Prof. G. Weihs, Universität Innsbruck

Dr. C. Schneider, Universität Würzburg

Funded by:

German Research Foundation, Grant-No.: Re2974/9-1


P. Munnelly et al., On-chip optoelectronic feedback in a micropillar laser-detector assembly , Optica 4, 303–306 (2017)

A. Thoma et al., A bright triggered twin-photon source in the solid state, ArXiv e-prints 1608.02768 (2016)

A. Schlehahn et al., An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency, APL Photonics 1, 011301 (2016)

Selected for cover image.

M. M. Karow et al., On-chip light detection using monolithically integrated quantum dot micropillars, Applied Physics Letters 108, 081110 (2016)

APL Editor's Pick by Shanhui Fan (week of Feb 28 2016).

P. Munnelly et al., A Pulsed Nonclassical Light Source Driven by an Integrated Electrically Triggered Quantum Dot Microlaser, IEEE Journal of Selected Topics in Quantum Electronics, 21, 1900609 (2015)


E. Stock, F. Albert, C. Hopfmann, M. Lermer, C. Schneider, S. Höfling, A. Forchel, M. Kamp, and S. Reitzenstein, On-Chip Quantum Optics with Quantum Dot Microcavities, Adv. Mater. 25, 707 (2013)

R. Horn, P. Abolghasem, B. J. Bijlani, D. Kang, A. S. Helmy, and G. Weihs, Monolithic Source of Photon Pairs, Phys. Rev. Lett. 108, 153605 (2012),

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