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. Please have a look at my project page for more information on this.

My further research interests are experimental tests of quantum mechanics via precision interferometry (see the topic multi-path interference on our group page), the development of efficient photonic interfaces for hybrid quantum networks as well as  quantum-enhanced spectroscopy and photonic quantum simulation.

Teaching

Winter term 2024/25:

• Vorlesung/Übung: Photonik VU 704707

Summer term 2024:

• Vorlesung: Physik2 - Elektromagnetismus und Optik VO704121

Winter term 2023/24:

• Vorlesung/Übung: Photonik VU 704707

Summer term 2023:

• Vorlesung: Physik2 - Elektromagnetismus und Optik VO704121
  

Winter term 2022/23:

• Vorlesung/Übung: Photonik VU 704707
  
• Ringvorlesung: Moderne Physik VO 744800

see also this automatically generated list in the LFU

Publications

My most recent publications are:

• 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.
• 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
• R. Keil, The right platform for the job, Nat. Phys. 15, 879 (2019), 10.1038/s41567-019-0591-8
• C. Dittel, G. Dufour, M. Walschaers, G. Weihs, A. Buchleitner, R. Keil, Totally Destructive Many-Particle Interference, Phys. Rev. Lett. 120, 240404 (2018), 10.1103/PhysRevLett.120.240404
• C. Dittel, G. Dufour, M. Walschaers, G. Weihs, A. Buchleitner, R. Keil, Totally Destructive Interference for Permutation-Symmetric Many-Particle States, Phys. Rev A 97, 062116 (2018), 10.1103/PhysRevA.97.062116
• G. Dufour, T. Brünner, C. Dittel, G. Weihs, R. Keil, and A. Buchleitner, Many-particle interference in a two-component bosonic Josephson junction: an all-optical simulation, New J. Phys. 19, 125015 (2017), DOI: 10.1088/1367-2630/aa8cf7
• T. Kauten, R. Keil, T. Kaufmann, B. Pressl, and G. Weihs, Obtaining tight bounds on higher-order interferences with a 5-path interferometer, New J. Phys. 19, 033017 (2017), DOI: 10.1088/1367-2630/aa5d98
• C. Dittel, R. Keil, G. Weihs, Many-body quantum interference on hypercubes, Quantum Sci. Technol. 2, 015003 (2017),  DOI: 10.1088/2058-9565/aa540c

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 PIN6357923 "Tailoring single photon spectra for hybrid quantum networks" (together with Michał Karpiński), 2024 - 2027

Previous Funding

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

FWF Lise-Meitner Fellowship M 1849 “Fundamental tests of quantum mechanics in optical waveguides” (09/2015 - 08/2017)