Zobrazeno 1 - 10
of 207
pro vyhledávání: '"Otfried Gühne"'
Publikováno v:
npj Quantum Information, Vol 10, Iss 1, Pp 1-6 (2024)
Abstract Quantum networks lead to novel notions of locality and correlations and an important problem concerns the question of which quantum states can be experimentally prepared with a given network structure and devices and which not. We prove that
Externí odkaz:
https://doaj.org/article/91276566598c41739b91f7fdc7e2071a
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-6 (2022)
The analysis of correlations in quantum networks is a difficult problem in the general case, and have so far been limited to small examples. Here, the authors show how to use symmetries and the inflation technique to derive general network entangleme
Externí odkaz:
https://doaj.org/article/f6d4e8a2d4474d29877a9ae71a184ed6
Autor:
Kiara Hansenne, Otfried Gühne
Publikováno v:
Entropy, Vol 25, Iss 9, p 1260 (2023)
Quantum networks offer a realistic and practical scheme for generating multiparticle entanglement and implementing multiparticle quantum communication protocols. However, the correlations that can be generated in networks with quantum sources and loc
Externí odkaz:
https://doaj.org/article/e3f51dfefc0e47398c716f676093ab27
Publikováno v:
PRX Quantum, Vol 4, Iss 2, p 020324 (2023)
We consider the problem of detecting the dimensionality of entanglement with the use of correlations between measurements in randomized directions. First, exploiting the recently derived covariance matrix criterion for the entanglement dimensionality
Externí odkaz:
https://doaj.org/article/3d70cda578af4557b0e22dc5d33286f7
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021)
The quantum marginal problem interrogates the existence of a global pure quantum state with some given marginals. Here, the authors reformulate it as an optimisation problem, and specifically as the existence of a two-party separable state with addit
Externí odkaz:
https://doaj.org/article/25a112ec79464b4da7e7a059124c7855
Publikováno v:
PRX Quantum, Vol 3, Iss 1, p 010340 (2022)
Many problems in information theory can be reduced to optimizations over matrices, where the rank of the matrices is constrained. We establish a link between rank-constrained optimization and the theory of quantum entanglement. More precisely, we pro
Externí odkaz:
https://doaj.org/article/e29bae34668043b5935601cb600389c9
Publikováno v:
Quantum, Vol 4, p 325 (2020)
We present in detail a statistical approach for the reference-frame-independent detection and characterization of multipartite entanglement based on moments of randomly measured correlation functions. We start by discussing how the corresponding mome
Externí odkaz:
https://doaj.org/article/85192f73045248d58b213ff0888774d6
Autor:
Andreas Ketterer, Otfried Gühne
Publikováno v:
Physical Review Research, Vol 2, Iss 2, p 023130 (2020)
In the course of the past decades entropic uncertainty relations have attracted much attention not only due to their fundamental role as manifestation of nonclassicality of quantum mechanics, but also as major tools for applications of quantum inform
Externí odkaz:
https://doaj.org/article/e15d18b39a2b4fd7b78954fad10dbbb5
Publikováno v:
New Journal of Physics, Vol 22, Iss 10, p 103037 (2020)
The correlations arising from sequential measurements on a single quantum system form a polytope. This is defined by the arrow-of-time (AoT) constraints, meaning that future choices of measurement settings cannot influence past outcomes. We discuss t
Externí odkaz:
https://doaj.org/article/c46488ca26b0448ab097c7735f3abdf6
Autor:
Cornelia Spee, Hendrik Siebeneich, Timm Florian Gloger, Peter Kaufmann, Michael Johanning, Matthias Kleinmann, Christof Wunderlich, Otfried Gühne
Publikováno v:
New Journal of Physics, Vol 22, Iss 2, p 023028 (2020)
Temporal correlations in quantum mechanics are the origin of several non-classical phenomena, but they depend on the dimension of the underlying quantum system. This allows one to use such correlations for the certification of a minimal Hilbert space
Externí odkaz:
https://doaj.org/article/8579383e9b8e44a4a5bdcd475cdfb9df