D
Denis Sych
Researcher at Russian Academy of Sciences
Publications - 51
Citations - 1271
Denis Sych is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Quantum key distribution & Quantum cryptography. The author has an hindex of 15, co-authored 48 publications receiving 1092 citations. Previous affiliations of Denis Sych include Moscow State University & National University of Science and Technology.
Papers
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Journal ArticleDOI
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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Experimental Realization of Quantum Tomography of Photonic Qudits via Symmetric Informationally Complete Positive Operator-Valued Measures
Nicolas Bent,Hammam Qassim,Asad A Tahir,Denis Sych,Gerd Leuchs,Gerd Leuchs,Luis L. Sánchez-Soto,Luis L. Sánchez-Soto,Ebrahim Karimi,Robert W. Boyd,Robert W. Boyd +10 more
TL;DR: In this paper, the authors implemented state tomography using symmetric informationally complete positive operator-valued measures for both pure and mixed photonic qudit states in Hilbert spaces of orbital angular momentum, including spaces whose dimension is not power of a prime.
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Feasibility of free space quantum key distribution with coherent polarization states
Dominique Elser,Tim J. Bartley,Tim J. Bartley,Bettina Heim,Ch. Wittmann,Ch. Wittmann,Denis Sych,Gerd Leuchs +7 more
TL;DR: In this paper, the feasibility of free space quantum key distribution with continuous variables under real atmospheric conditions was demonstrated for the first time, where signal and local oscillator were combined in a single spatial mode, which auto-compensates atmospheric fluctuations and results in an excellent interference.
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Demonstration of Coherent-State Discrimination Using a Displacement-Controlled Photon-Number-Resolving Detector
Christoffer Wittmann,Christoffer Wittmann,Ulrik L. Andersen,Ulrik L. Andersen,Ulrik L. Andersen,Masahiro Takeoka,Denis Sych,Gerd Leuchs,Gerd Leuchs +8 more
TL;DR: A new measurement scheme based on a displacement operation followed by a photon-number-resolving detector is experimentally demonstrated, and it is shown that it outperforms the standard homodyne detector and proves to be optimal within all Gaussian operations including conditional dynamics.
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Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
Christoffer Wittmann,Christoffer Wittmann,Ulrik L. Andersen,Ulrik L. Andersen,Masahiro Takeoka,Denis Sych,Denis Sych,Gerd Leuchs,Gerd Leuchs +8 more
TL;DR: In this paper, a postselection strategy was applied to the measurement data of a homodyne detector as well as a photon number resolving detector in order to lower the error probability.