P14 - Integrated Quantum Photonics

Gregor Weihs


This project part targets optical quantum information processing on a highly integrated III-V semiconductor platform. This platform is extremely versatile, because it goes beyond just passive elements but hosts single photon and photon pair sources based on quantum dots and on spontaneous parametric down-conversion. Furthermore, it supports active elements such as fast electro-optic modulators and even detectors and, importantly, also supports generating the original optical energy supply, i.e. light for exciting and controlling quantum light sources on-chip.

It can be efficiently interfaced to long-distance quantum communication channels and connected to atomic and solid-state systems. In support of the vision of a complete optical quantum information processor, in the first four years we will complement our previously developed on-chip entangled photon pair source with linear optical elements and lasers to become completely integrated sources with appropriate interfaces and encoding schemes to connect to long-distance quantum communication channels and stationary qubits. We will extend this functionality to generate multipartite entangled states on the chip and use these to characterize the multipath interferometers as unitary quantum information processors.

PI Gregor Weihs on
Integrated Quantum Photonics


Subproject Leader: Gregor Weihs

PostDocs: Stefan Frick

PhDs: Hannah Thiel, Schlager Alexander, Wagner Marita

Admin: Marie-Luise Müller


Approaching the Tsirelson bound with a Sagnac source of polarization-entangled photons
S. Meraner, R. J. Chapman, St. Frick, R. Keil, M. Prilmüller, G. Weihs
arXiv: 2008.01575] [quant-ph] (2020)

Understanding photoluminescence in semiconductor Bragg-reflection waveguides: Towards an integrated, GHz-rate telecom photon pair source
S. Auchter, A. Schlager, H. Thiel, K. Laiho, B. Pressl, H. Suchomel, M. Kamp, S. Höfling, Ch. Schneider, G. Weihs
arXiv: 2010.05474] [quant-ph] (2020)

Complementarity between one- and two-body visibilities
C. Dittel, G. Weihs
arXiv:2003.01563] [quant-ph] (2020)

Wave-particle duality of many-body quantum states
C. Dittel, G. Dufour, G. Weihs, A. Buchleitner
[arXiv:1901.02810] [quant-ph] (2019)

For group publications: see here.