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Prof. Dr. Birgit Stiller

Professor

My fields of expertise are Brillouin scattering and optomechanics, nonlinear fiber optics and photonic circuits, as well as classical and quantum communications. The projects in my group span from nonlinear optics to quantum optics with a focus on light-sound interactions and waveguide optomechanics. We want to explore optoacoustic interaction experimentally at the classical and quantum level with suitably engineered microstructured fibres and nanowaveguides to manipulate, in this way, light states

2015

Risk Analysis of Trojan-Horse Attacks on Practical Quantum Key Distribution Systems

Nitin Jain, Birgit Stiller, Imran Khan, Vadim Makarov, Christoph Marquardt, Gerd Leuchs

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 21 (3) 6600710 (2015) | Journal

An eavesdropper Eve may probe a quantum key distribution (QKD) system by sending a bright pulse from the quantum channel into the system and analyzing the back-reflected pulses. Such Trojan-horse attacks can breach the security of the QKD system, if appropriate safeguards are not installed or if they can be fooled by the Eve. We present a risk analysis of such attacks based on extensive spectral measurements, such as transmittance, reflectivity, and detection sensitivity of some critical components used in a typical QKD systems. Our results indicate the existence of wavelength regimes, where the attacker gains considerable advantage as compared to launching an attack at 1550 nm. We also propose countermeasures to reduce the risk of such attacks.

Depolarized guided acoustic wave Brillouin scattering in hollow-core photonic crystal fibers

Wenjia Elser Nee Zhong, Birgit Stiller, Dominique Elser, Bettina Heim, Christoph Marquardt, Gerd Leuchs

OPTICS EXPRESS 23 (21) UNSP 247705 27707-27714 (2015) | Journal

By performing quantum-noise-limited optical heterodyne detection, we observe polarization noise in light after propagation through a hollow-core photonic crystal fiber (PCF). We compare the noise spectrum to the one of a standard fiber and find an increase of noise even though the light is mainly transmitted in air in a hollow-core PCF. Combined with our simulation of the acoustic vibrational modes in the hollow-core PCF, we are offering an explanation for the polarization noise with a variation of guided acoustic wave Brillouin scattering (GAWBS). Here, instead of modulating the strain in the fiber core as in a solid core fiber, the acoustic vibrations in hollow-core PCF influence the effective refractive index by modulating the geometry of the photonic crystal structure. This induces polarization noise in the light guided by the photonic crystal structure. (C) 2015 Optical Society of America

Classically entangled optical beams for high-speed kinematic sensing

Stefan Berg-Johansen, Falk Toeppel, Birgit Stiller, Peter Banzer, Marco Ornigotti, Elisabeth Giacobino, Gerd Leuchs, Andrea Aiello, Christoph Marquardt

OPTICA 2 (10) 864-868 (2015) | Journal

Tracking the kinematics of fast-moving objects is an important diagnostic tool for science and engineering. Here, we demonstrate an approach to positional and directional sensing based on the concept of classical entanglement in vector beams of light [Found. Phys. 28, 361 -374 (1998)]. The measurement principle relies on the intrinsic correlations existing in such beams between transverse spatial modes and polarization. The latter can be determined from intensity measurements with only a few fast photodiodes, greatly outperforming the bandwidth of current CCD/CMOS devices. In this way, our setup enables two-dimensional real-time sensing with temporal resolution in the GHz range. We expect the concept to open up new directions in metrology and sensing. (C) 2015 Optical Society of America

Scientific career

  • since 2024 also W3 Full Professorship at Leibniz University Hannover
  • 04/2019 – Independent Max Planck Research Group Leader (centrally funded, selected in the competitive call 2017), Max Planck Institute for the Science of Light, Germany, Quantum Optoacoustic
  • 04/2021- 09/2022 Temporary W3 Full Professorship (Lehrstuhlvertretung), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Chair of Optics
  • 06/2015 – 02/2019 Research fellow, The University of Sydney, CUDOS, Australia, Nonlinear Optical Phononics (Prof. Benjamin Eggleton)
  • 10/2012 – 05/2015 Postdoctoral fellow, Max Planck Institute for the Science of Light, Germany, Optical Communication and Quantum Communication (Prof. Gerd Leuchs)
  • 02/2012 – 09/2012Postdoctoral fellow, CNRS Institute FEMTO-ST, Besançon, France, Nonlinear Optics and Optoacoustics (Dr. Thibaut Sylvestre)

 

Academic education

  • 01/2009 – 01/2012 Doctoral thesis, CNRS Institute FEMTO-ST, Besançon, France, “Brillouin scattering in photonic crystal fibre: from fundamentals to fibre optic sensors”, (Dr. Thibaut Sylvestre, Dr. Hervé Maillotte)
  • 10/2003 – 12/2008 Master’s degree Mathematics / Physics / Education, University of Erlangen-Nuremberg, Germany, Master thesis: „Fabrication of periodically poled LiNbO3 for nonlinear optical frequency conversion by quasi phase matching“ (Prof. Jan-Peter Meyn, Prof. Christine Silberhorn)

 

Selected awards, fellowships, services

  • 2024 - ERC Consolidator Grant
  • 2024 - Henriette Hertz Scout of the Humbold Foundation
  • 2024 - Photonics100 2025 List
  • 2022 Conference chair, Lorentz Workshop “Quantum Optics meets Acoustics”, Leiden, Netherlands (14-18 November 2021)
  • 2020 Editorial board New Journal of Physics
  • 2020 Fellow of the Max Planck School of Photonics
  • 2019-2021 Conference chair, “Workshop on Optomechanics and Brillouin scattering - WOMBAT 2021/2022”, Erlangen, Germany (16-18 June 2021 and 14-17 June 2022)
  • 2019 Conference chair, “Workshop on Optomechanics and Brillouin scattering - WOMBAT 2021”, Erlangen, Germany (planned for 16-18 June 2021)
  • 2019 Guest editor for APL Photonics for the Topical Issue “Optoacoustics - Advances in High-Frequency Optomechanics and Brillouin Scattering”
  • 2018 Co-Chair, “Nanophotonics 2018 – the next frontier”, Canberra, Australia
  • 2016 Co-Chair, “Quantum photonic connections conference”, Sydney, Australia
  • 2013 – 2015 Cusanuswerk career development program
  • 2011 Prix A’Doc 2011 of the Université Franche-Comté
  • 2009 – 2011 CNRS PhD Scholarship
  • 2009 Ohm-Preis 2008/2009 of the Physics department at the University of Erlangen-Nuremberg, Germany
  • 2004 – 2008 Scholarship Cusanuswerk
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