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Christoph Marquardt
Researcher at Max Planck Society
Publications - 196
Citations - 7678
Christoph Marquardt is an academic researcher from Max Planck Society. The author has contributed to research in topics: Photon & Quantum key distribution. The author has an hindex of 43, co-authored 192 publications receiving 6429 citations. Previous affiliations of Christoph Marquardt include University of Erlangen-Nuremberg & Technical University of Denmark.
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Journal ArticleDOI
High-dimensional intracity quantum cryptography with structured photons
Alicia Sit,Frédéric Bouchard,Robert Fickler,Jérémie Gagnon-Bischoff,Hugo Larocque,Khabat Heshami,Dominique Elser,Christian Peuntinger,Kevin Günthner,Bettina Heim,Christoph Marquardt,Gerd Leuchs,Robert W. Boyd,Ebrahim Karimi +13 more
TL;DR: It is demonstrated that, even through moderate turbulence without active wavefront correction, high-dimensional photon states are advantageous for securely transmitting more information, opening the way for intracity high- dimensional quantum communications under realistic conditions.
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A generator for unique quantum random numbers based on vacuum states
Christian Gabriel,Christoffer Wittmann,Denis Sych,Ruifang Dong,Ruifang Dong,Ruifang Dong,Wolfgang Mauerer,Ulrik L. Andersen,Christoph Marquardt,Gerd Leuchs +9 more
TL;DR: Researchers demonstrate random-number generation by exploiting the intrinsic randomness of vacuum states, which may lead to reliable and high-speed quantum random- number generators for applications ranging from gambling to cryptography.
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30 years of squeezed light generation
TL;DR: A review of the main experimental platforms for generating quadrature squeezed light can be found in this paper, where the authors review the main platforms for the last 30 years of Squeezed Light Generation.
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Device Calibration Impacts Security of Quantum Key Distribution
Nitin Jain,Christoffer Wittmann,Lars Lydersen,Carlos Wiechers,Dominique Elser,Christoph Marquardt,Vadim Makarov,Gerd Leuchs +7 more
TL;DR: This work proposes and experimentally demonstrate a method to induce a large temporal detector efficiency mismatch in a commercial QKD system by deceiving a channel length calibration routine, and devise an optimal and realistic strategy using faked states to break the security of the cryptosystem.
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Naturally phase-matched second-harmonic generation in a whispering-gallery-mode resonator.
Josef U. Fürst,Josef U. Fürst,Dmitry Strekalov,Dmitry Strekalov,Dominique Elser,Dominique Elser,Mikael Lassen,Mikael Lassen,Ulrik L. Andersen,Ulrik L. Andersen,Christoph Marquardt,Christoph Marquardt,Gerd Leuchs,Gerd Leuchs +13 more
TL;DR: It is observed that conversion efficiencies of 9% at 30µW pump power in LiNbO3 , as well as self-limiting effects at high powers.