Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Ch Marquardt"'
Publikováno v:
New Journal of Physics, Vol 25, Iss 8, p 083008 (2023)
The Hong–Ou–Mandel (HOM) interference is one of the most intriguing quantum optical phenomena and crucial in performing quantum optical communication and computation tasks. Lately, twin beam emitters such as those relying on the process of parame
Externí odkaz:
https://doaj.org/article/7a605eafc627499891c6a87f4eedb417
Publikováno v:
New Journal of Physics, Vol 21, Iss 9, p 093047 (2019)
Coherent beam combining refers to the process of generating a bright output beam by merging independent input beams of individually diffusing relative phases by locking them to each other. We report the first quantum mechanical noise limit calculatio
Externí odkaz:
https://doaj.org/article/04a6df309db7406daa3e1a88ec741865
Autor:
C R Müller, Ch Marquardt
Publikováno v:
New Journal of Physics, Vol 17, Iss 3, p 032003 (2015)
The impossibility of perfectly discriminating non-orthogonal quantum states imposes far-reaching consequences both on quantum and classical communication schemes. We propose and numerically analyze an optimized quantum receiver for the discrimination
Externí odkaz:
https://doaj.org/article/1974110d1a1d4583b7daa02ed569bfa6
Publikováno v:
New Journal of Physics, Vol 16, Iss 11, p 113018 (2014)
We present a quantum communication experiment conducted over a point-to-point free-space link of 1.6 km in urban conditions. We study atmospheric influences on the capability of the link to act as a continuous-variable (CV) quantum channel. Continuou
Externí odkaz:
https://doaj.org/article/d2dd56b5de7240b991635e020a7f5d0c
Publikováno v:
New Journal of Physics, Vol 14, Iss 8, p 083009 (2012)
We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of our hybrid scheme is superior to the standard scheme—heterodyne detectio
Externí odkaz:
https://doaj.org/article/cbc06cceb7c64b638d038f43af31abd0
Autor:
Dominique Elser, Ömer Bayraktar, Björn Gütlich, Daniel Tröndle, Gerd Leuchs, Karen Saucke, S. Seel, Ch. Marquardt, Peter Greulich, Ines Richter, Kevin Günthner, Imran Khan, Herwig Zech, Sabine Philipp-May, Birgit Stiller, F. Heine, Christian Müller
Publikováno v:
International Conference on Space Optics — ICSO 2016.
Quantum optics [1] can be harnessed to implement cryptographic protocols that are verifiably immune against any conceivable attack [2]. Even quantum computers, that will break most current public keys [3, 4], cannot harm quantum encryption. Based on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::828d232c821fa0f8d5a30b33a838f5f0
https://doi.org/10.1117/12.2296184
https://doi.org/10.1117/12.2296184
Autor:
Ch. Marquardt, Kevin Günthner, Werner Vogel, D. Vasylyev, A. A. Semenov, Ömer Bayraktar, A. Thurn
Free-space optical communication links are promising channels for establishing secure quantum communication. Here we study the transmission of nonclassical light through a turbulent atmospheric link under diverse weather conditions, including rain or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1087d83fc4c3522f64b454b44584b329
http://arxiv.org/abs/1707.04932
http://arxiv.org/abs/1707.04932
Publikováno v:
Mueller, C R, Leuchs, G, Marquardt, C & Andersen, U L 2017, ' Optimally cloned binary coherent states ', Physical Review A (Atomic, Molecular and Optical Physics), vol. 96, no. 4, 042311 . https://doi.org/10.1103/PhysRevA.96.042311
Binary coherent state alphabets can be represented in a two-dimensional Hilbert space. We capitalize this formal connection between the otherwise distinct domains of qubits and continuous variable states to map binary phase-shift keyed coherent state
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e22d99157b1455a82bf890bd14abfae
https://orbit.dtu.dk/en/publications/39e19c92-0ced-4425-beb4-b2242bd8cf2c
https://orbit.dtu.dk/en/publications/39e19c92-0ced-4425-beb4-b2242bd8cf2c
Autor:
Nitin Jain, Paul Jouguet, Ch. Marquardt, Imran Khan, Eleni Diamanti, Birgit Stiller, Gerd Leuchs, Sébastien Kunz-Jacques
Publikováno v:
Scopus-Elsevier
We experimentally demonstrate successful Trojan-horse attacks on laboratory and commercial continuous-variable quantum key distribution systems with binary and Gaussian modulation. Furthermore, we analyze appropriate countermeasures regarding their s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f83c20aee7d513a32dabc4a9d822553
https://doi.org/10.1364/cleo_qels.2015.ff1a.7
https://doi.org/10.1364/cleo_qels.2015.ff1a.7
Publikováno v:
The European Physical Journal D - Atomic, Molecular and Optical Physics. 18:229-235
We present schemes for the generation and evaluation of continuous variable entanglement of bright optical beams and give a brief overview of the variety of optical techniques and quantum communication applications on this basis. A new entanglement-b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8edfefbdd87c139e2827c2f392f7c784
https://doi.org/10.1140/epjd/e20020027
https://doi.org/10.1140/epjd/e20020027