Dr. Robert Keil

Senior Scientist

Research interests

My primary research field is the dynamics of non-interacting particles, with a special emphasis on the generation of multi-photon states and their interference. We apply these effects for the tailored generation of complex entangled states of light as well as towards the implementation of more efficient interfaces in hybrid quantum networks. Further research interest of mine are experimental tests of the foundations of quantum mechanics as well as quantum-enhanced optical interferometry. Please have a look at my team's research page for more information. 

 

Teaching

Teaching in recent semesters:

Summer term 2026:

• Vorlesung: Physik2 - Elektromagnetismus und Optik VO 704121

Winter term 2025/26:

• Vorlesung/Übung: Photonik VU 704705

• Ringvorlesung: Moderne Physik VO 744800

Summer term 2025:

• Laborpraktikum: PR Spezielles Fortgeschrittenenpraktikum A: Experimentalphysik 704805

Winter term 2024/25:

• Vorlesung/Übung: Photonik VU 704707

Summer term 2024:

• Vorlesung: Physik2 - Elektromagnetismus und Optik VO 704121

Winter term 2023/24:

• Vorlesung/Übung: Photonik VU 704707

see also this automatically generated list in the LFU

Publications

My most recent publications are:

• T. Faleo, F. Steinhauser, G. Weihs, S. Frick, R. Keil, Photonic hyperentanglement in polarisation and frequency via joint spectrum shaping, Opt. Quantum 4, 333 (2026) (DOI)
• T. Faleo, C. L. Morrison, R. Beignon, F. Graffitti, V. Remesh, S. Frick, A. Fedrizzi, G. Weihs, R. Keil, Optimized spectral purity of unfiltered photons via pump and nonlinearity shaping, Appl. Phys. Lett. 128, 204004 (2026) (DOI)
• P. Mark, S. Gstir, J. Münzberg, G. Weihs, R. Keil, "Nonlinear response of telecom-wavelength superconducting single-photon detectors," APL Quantum 1, 046109 (2024) 10.1063/5.0231297
• T. Faleo, E. Brunner, J. Webb, A. Pickston, J. Ho, G. Weihs, A. Buchleitner, C. Dittel, G. Dufour, A. Fedrizzi and R. Keil, "Entanglement-induced collective many-body interference," Science Advances 10, eadp9030 (2024) 10.1126/sciadv.adp9030
• S. Frick, R. Keil, V. Remesh, G. Weihs, "Single photon sources for multi-photon applications," in Photonic Quantum Technologies, M. Beyouncef ed. (Wiley, 2023), 10.1002/9783527837427.ch4
• J. Münzberg, F. Draxl, S. F. Covre da Silva, Y. Karli, S. Manna, A. Rastelli, G. Weihs, R. Keil, Fast and efficient demultiplexing of single photons from a quantum dot with resonantly enhanced electro-optic modulators, APL Photonics 7, 070802 (2022) 10.1063/5.0091867
• S. Gstir, E. Chan, T. Eichelkraut, A. Szameit, R. Keil, G. Weihs, Towards probing for hypercomplex quantum mechanics in a waveguide interferometer, New. J. Phys. 23, 093038 (2021), 10.1088/1367-2630/ac2451
• J. Münzberg, C. Dittel, M. Lebugle, A. Buchleitner, A. Szameit, G. Weihs, R. Keil, Symmetry allows for distinguishability in totally destructive many-particle interference, PRX Quantum 2, 020326 (2021), 10.1103/PRXQuantum.2.020326
• M. Ehrhardt, R. Keil, L. J. Maczewsky, C. Dittel, M. Heinrich, A. Szameit, Exploring complex graphs using three-dimensional quantum walks of correlated photons, Sci. Adv. 7, eabc5266 (2021), 10.1126/sciadv.abc5266
• S. Meraner, R. J. Chapman, S. Frick, R. Keil, M. Prilmüller, G. Weihs, Approaching the Tsirelson bound with a Sagnac source of polarization-entangled photons, SciPost Phys.10, 017 (2021), 10.21468/SciPostPhys.10.1.017

For a complete list of publications, please see ORCID ID: 0000-0003-1198-9961 or Researcher ID: J-2546-2014

Current Funding

FWF international project PIN 6357923 “Tailoring single photon spectra for hybrid quantum networks” (together with Michał Karpiński), 2024 - 2027

FWF International project PIN9593224 "Hybrid photonic circuits for fundamental quantum physics" (together with Robert Chapman and Rachel Grange, ETH Zurich, and Tobias Vogl, TU Munich), 2025 - 2028

Previous Funding

FWF stand-alone project P 30459 “Many-particle interference in symmetric scattering scenarios” [project page] (2017 - 2022)

FWF Lise-Meitner Fellowship M 1849 “Fundamental tests of quantum mechanics in optical waveguides” (2015 - 2017)