Prof. Gerd Leuchs Profile

Prof. Gerd Leuchs

Physicist & Professor at Max-Planck-Institut für die Physik des Lichts

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Author

Publications (17)

Proceedings Article | 12 March 2024 Presentation + Paper

Enabling single photon imaging at kHz frame rates using digital holography

Osian Wolley, Simon Mekhail, Thomas Gregory, Paul-Antoine Moreau, Gerd Leuchs, Miles Padgett

Proceedings Volume 12853, 1285305 (2024) https://doi.org/10.1117/12.3001443

KEYWORDS: Signal to noise ratio, Cameras, Holography, Signal detection, Interference (communication), Speckle pattern, Sensors, Light sources and illumination, Digital holography, 3D image reconstruction

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Proceedings Article | 17 March 2023 Presentation + Paper

Dynamics of development of laser-induced structures on the surface of a titanium alloy

Iana Fomicheva, Petr Druzhinin, Hans Amler, Wolfgang Schuesslbauer, Silke Christiansen, Gerd Leuchs

Proceedings Volume 12409, 124090U (2023) https://doi.org/10.1117/12.2649015

KEYWORDS: Pulsed laser operation, Titanium, Alloys, Laser development, Picosecond phenomena, Scanning electron microscopy, Laser processing, Biomedical applications, Surface properties, Spatial frequencies

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Proceedings Article | 17 March 2023 Open Access

Initial surface roughness influence on the generation of LIPSS on titanium and stainless steel and their effect on cell/bacteria viability

Lamborghini Sotelo, Tommaso Fontanot, Sanjana Vig, Maria Helena Fernandes, George Sarau, Gerd Leuchs, Silke Christiansen

Proceedings Volume 12409, 124090S (2023) https://doi.org/10.1117/12.2648921

KEYWORDS: Stainless steel, Polishing, Titanium, Surface finishing, Scanning electron microscopy, Laser irradiation, Bacteria, Surface roughness

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Proceedings Article | 30 June 2022 Open Access

Max Planck School of Photonics: developing curriculum and outreach measures for a network of excellence

Reinhard Geiss, Julia Hengster, Anna-Katharina Grimm, Thomas Kaiser, Gerd Leuchs, Andreas Tünnermann

Proceedings Volume 12297, 1229706 (2022) https://doi.org/10.1117/12.2635507

KEYWORDS: Photonics, Web 2.0 technologies, Social networks, Precision optics, Physics, Integrated optics, Education and training, Chemical elements, Standards development, Digital photography

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Proceedings Article | 5 March 2021 Presentation

Turbulence-resilient high-capacity free-space optical communication

Ziyi Zhu, Alexander Fyffe, Yiyu Zhou, Gerd Leuchs, Robert Boyd, Zhimin Shi

Proceedings Volume 11701, 1170107 (2021) https://doi.org/10.1117/12.2583256

KEYWORDS: Free space optical communications, Atmospheric turbulence, Polarization, Free space optics, Free space, Atmospheric optics, Adaptive optics

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Proceedings Article | 5 March 2021 Presentation

Light in 3D: Implications and applications of the inherent longitudinal and transverse nature of electromagnetic fields

Gerd Leuchs, Peter Banzer

Proceedings Volume 11701, 117010O (2021) https://doi.org/10.1117/12.2584465

KEYWORDS: Light scattering, Electromagnetism, 3D applications, Polarization, Particles, Optical testing, Laser scattering, Ultrafast phenomena, Ultrafast measurement systems, Scattering

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Proceedings Article | 7 October 2019 Paper

Stratospheric QKD: feasibility analysis and free-space optics system concept

Florian Moll, Thierry Botter, Christoph Marquardt, David Pusey, Amita Shrestha, Andrew Reeves, Kevin Jaksch, Kevin Gunthner, Oemer Bayraktar, Christian Mueller-Hirschkorn, Alberto Diago Gallardo, Dionisio Diaz Gonzalez, Wenjamin Rosenfeld, Peter Freiwang, Gerd Leuchs, Harald Weinfurter

Proceedings Volume 11167, 111670H (2019) https://doi.org/10.1117/12.2539076

KEYWORDS: Quantum key distribution, Free space optics, Telescopes, Adaptive optics, Electronics, Receivers, Atmospheric particles, Polarization, Atmospheric modeling, Telecommunications

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Quantum key distribution (QKD) is one of the most mature quantum technologies and can provide quantum-safe security in future communication networks. Since QKD in fiber is limited to a range of few hundred kilometers, one approach to bridge continental scale distances may be the use of high altitude pseudo satellites (HAPS) as mobile trusted nodes in the stratosphere. In parallel, free-space laser communication for high rate data transmission has been a subject of research and development for several decades and its commercialization is progressing rapidly. Important synergies exist between classical free-space communication and QKD systems since the quantum states are often implemented using the same degrees of freedom such as polarization or field amplitude and phase. These synergies can be used to benefit from the progress in classical free-space laser communication in QKD applications. In this paper, the use case of QKD in a stratospheric environment is described wherein HAPS may serve as relay station of secret keys and encrypted data. The mission scenario and HAPS capabilities are analyzed to derive special requirements on the stratospheric laser terminal, the link geometry and the ground segment with respect to a feasibility demonstration. To obtain a flexible and compatible system, discrete variable and continuous variable QKD protocols are considered to be implemented side by side in the HAPS payload. Depending on the system parameters, it can be beneficial to use the one or the other kind of protocol. Thus, a direct comparison of both in one and the same system is of scientific interest. Each of the protocols has particular requirements on coupling efficiency and implementation. Link budget calculations are performed to analyze possible distances, key rates and data transmission rates for the different schemes. In case of the QKD system, the mean coupling efficiency is of main interest, i.e. signal fluctuations arising from atmospheric turbulence must be taken into account in the security proof, but the buffered key generation relaxes real-time requirements. This is different to classical communications, where the corresponding fading loss must be assessed. A system architecture is presented that comprises the optical aircraft terminal, the optical ground terminal and the most important subsystems that enable implementation of the considered QKD protocols. The aircraft terminal is interfaced with the dedicated quantum transmitter module (Alice) and the ground station with the dedicated quantum receiver module (Bob). The optical interfaces are SMF couplings which put high requirements on the receiving optics, in particular the need for wave-front correction with adaptive optics. The findings of the system study are reviewed and necessary next steps pointed out.

Proceedings Article | 2 July 2019 Open Access

Max Planck School of Photonics: research-oriented photonics education in a network of excellence throughout Germany

Reinhard Geiss, Julia Hengster, Thomas Kaiser, Gerd Leuchs, Andreas Tünnermann

Proceedings Volume 11143, 1114303 (2019) https://doi.org/10.1117/12.2524606

KEYWORDS: Photonics, Physics, Standards development, Laser applications, Quantum optics, Visibility

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Proceedings Article | 25 September 2017 Open Access

Quantum measurements of signals from the Alphasat TDP1 laser communication terminal

D. Elser, K. Günthner, I. Khan, B. Stiller, Ö Bayraktar, C. Müller, K. Saucke, D. Tröndle, F. Heine, S. Seel, P. Greulich, H. Zech, B. Gütlich, I. Richter, S. Philipp-May, Ch. Marquardt, G. Leuchs

Proceedings Volume 10562, 105623O (2017) https://doi.org/10.1117/12.2296184

KEYWORDS: Quantum key distribution, Quantum communications, Satellites, Laser communications, Astronomical imaging, Quantum cryptography, Satellite communications, Networks, Quantum optics, Adaptive optics

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Proceedings Article | 8 June 2017 Presentation

Optical harmonic generation enhanced due to ultrafast intensity fluctuations (Conference Presentation)

Denis Kopylov, Kirill Spasibko, Viktor Krutyanskiy, Tatiana Murzina, Gerd Leuchs, Maria Chekhova

Proceedings Volume 10228, 1022808 (2017) https://doi.org/10.1117/12.2265330

KEYWORDS: Crystals, Laser crystals, Sapphire lasers, Optical filters, Harmonic generation, Nonlinear dynamics, Correlation function, Ultrafast phenomena, Photons, Nonlinear crystals

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Proceedings Article | 7 December 2016 Presentation

Proof-of-principle test of coherent-state continuous variable quantum key distribution through turbulent atmosphere (Conference Presentation)

Ivan Derkach, Christian Peuntinger, László Ruppert, Bettina Heim, Kevin Gunthner, Vladyslav Usenko, Dominique Elser, Christoph Marquardt, Radim Filip, Gerd Leuchs

Proceedings Volume 9996, 999605 (2016) https://doi.org/10.1117/12.2242107

KEYWORDS: Quantum key distribution, Transmittance, Modulation, Information security, Computer security, Data modeling, Quantum information theory, Quantum information, Quantum physics, Fiber optics

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Continuous-variable quantum key distribution is a practical application of quantum information theory that is aimed at generation of secret cryptographic key between two remote trusted parties and that uses multi-photon quantum states as carriers of key bits. Remote parties share the secret key via a quantum channel, that presumably is under control of of an eavesdropper, and which properties must be taken into account in the security analysis. Well-studied fiber-optical quantum channels commonly possess stable transmittance and low noise levels, while free-space channels represent a simpler, less demanding and more flexible alternative, but suffer from atmospheric effects such as turbulence that in particular causes a non-uniform transmittance distribution referred to as fading. Nonetheless free-space channels, providing an unobstructed line-of-sight, are more apt for short, mid-range and potentially long-range (using satellites) communication and will play an important role in the future development and implementation of QKD networks. It was previously theoretically shown that coherent-state CV QKD should be in principle possible to implement over a free-space fading channel, but strong transmittance fluctuations result in the significant modulation-dependent channel excess noise. In this regime the post-selection of highly transmitting sub-channels may be needed, which can even restore the security of the protocol in the strongly turbulent channels. We now report the first proof-of-principle experimental test of coherent state CV QKD protocol using different levels Gaussian modulation over a mid-range (1.6-kilometer long) free-space atmospheric quantum channel. The transmittance of the link was characterized using intensity measurements for the reference but channel estimation using the modulated coherent states was also studied. We consider security against Gaussian collective attacks, that were shown to be optimal against CV QKD protocols . We assumed a general entangling cloner collective attack (modeled using data obtained from the state measurement results on both trusted sides of the protocol), that allows to purify the noise added in the quantum channel . Our security analysis of coherent-state protocol also took into account the effect of imperfect channel estimation, limited post-processing efficiency and finite data ensemble size on the performance of the protocol. In this regime we observe the positive key rate even without the need of applying post-selection. We show the positive improvement of the key rate with increase of the modulation variance, still remaining low enough to tolerate the transmittance fluctuations. The obtained results show that coherent-state CV QKD protocol that uses real free-space atmospheric channel can withstand negative influence of transmittance fluctuations, limited post-processing efficiency, imperfect channel estimation and other finite-size effects, and be successfully implemented. Our result paves the way to the full-scale implementation of the CV QKD in real free-space channels at mid-range distances.

Proceedings Article | 20 February 2014 Paper

All-optical signal regeneration of advanced modulation formats

Tobias Roethlingshoefer, Thomas Richter, Birgit Stiller, Georgy Onishchukov, Colja Schubert, Bernhard Schmauss, Gerd Leuchs

Proceedings Volume 8964, 89640L (2014) https://doi.org/10.1117/12.2042852

KEYWORDS: Phase shift keying, Modulation, Quadrature amplitude modulation, Numerical simulations, Signal processing, Nonlinear optics, Sagnac interferometers, Phase shifts, Interference (communication), Optical amplifiers

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Proceedings Article | 29 October 2013 Paper

Quantum key distribution: vulnerable if imperfectly implemented

G. Leuchs

Proceedings Volume 8899, 88990L (2013) https://doi.org/10.1117/12.2033066

KEYWORDS: Quantum key distribution, Sensors, Avalanche photodetectors, Neodymium, Calibration, Information security, Phase modulation, Ions, Modulators, Quantum communications

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Proceedings Article | 23 March 2011 Paper

Nonlinear phase-shift compensation for DQPSK signals using a nonlinear amplifying loop mirror

Klaus Sponsel, Christian Stephan, Georgy Onishchukov, Bernhard Schmauss, Gerd Leuchs

Proceedings Volume 7822, 782204 (2011) https://doi.org/10.1117/12.887194

KEYWORDS: Phase shift keying, Phase shifts, Nonlinear optics, Interference (communication), Mirrors, Performance modeling, Systems modeling, Complex systems, Kerr effect, Receivers

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Proceedings Article | 23 January 2010 Paper

Phase-preserving amplitude noise suppression using an attenuation-imbalanced NOLM

E. Parsons, C. Stephan, K. Sponsel, T. Roethlingshoefer, F. Küppers, G. Onishchukov, B. Schmauss, G. Leuchs

Proceedings Volume 7621, 762109 (2010) https://doi.org/10.1117/12.843721

KEYWORDS: Signal attenuation, Phase shifts, Phase shift keying, Attenuators, Eye, Mirrors, Optical amplifiers, Phase transfer function, Picosecond phenomena, Scanning probe microscopy

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Proceedings Article | 11 August 2008 Paper

Interferometric null test of a parabolic reflector generating a Hertzian dipole field

G. Leuchs, K. Mantel, A. Berger, H. Konermann, M. Sondermann, U. Peschel, N. Lindlein, J. Schwider

Proceedings Volume 7063, 706314 (2008) https://doi.org/10.1117/12.797423

KEYWORDS: Mirrors, Interferometry, Optical spheres, Reflectors, Spherical lenses, Eye, 3D vision, Telescopes, Interferometers, Solids

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Proceedings Article | 20 June 2002 Paper

Polarization-dependent effects on phase singularities in the vicinity of sub-lambda structures

Manfred Eberler, Susanne Quabis, Ralf Dorn, Gerd Leuchs

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472236

KEYWORDS: Phase measurement, Spiral phase plates, Polarization, Silicon, Microscopes, Objectives, Image processing, Numerical simulations, Gold, Diffusers

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Showing 5 of 17 publications

Conference Committee Involvement (4)

The International Conference on Coherent and Nonlinear Optics

28 May 2007 | Minsk, Belarus

Noise and Information in Nanoelectronics, Sensors, and Standards III

24 May 2005 | Austin, Texas, United States

Fluctuations and Noise in Photonics and Quantum Optics II

26 May 2004 | Maspalomas, Gran Canaria Island, Spain

Fluctuations and Noise in Photonics and Quantum Optics

2 June 2003 | Santa Fe, New Mexico, United States

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