Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Bužek, Vladimír"'
Publikováno v:
Physica A 420 (2015) 200-211
We propose a thermodynamic multi-state spin model in order to describe equilibrial behavior of a society. Our model is inspired by the Axelrod model used in social network studies. In the framework of the statistical mechanics language, we analyze ph
Externí odkaz:
http://arxiv.org/abs/1403.1771
We apply semidefinite programming for designing 1 to 2 symmetric qubit quantum cloners. These are optimized for the average fidelity of their joint output state with respect to a product of multiple originals. We design 1 to 2 quantum bit cloners usi
Externí odkaz:
http://arxiv.org/abs/1304.1326
Publikováno v:
Acta Physica Slovaca 61, No.6, 603-725 (2011)
This tutorial article showcases the many varieties and uses of quantum walks. Discrete time quantum walks are introduced as counterparts of classical random walks. The emphasis is on the connections and differences between the two types of processes
Externí odkaz:
http://arxiv.org/abs/1207.7283
Publikováno v:
Physical Review A 86, 052109 (2012)
The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parame
Externí odkaz:
http://arxiv.org/abs/1207.3053
Publikováno v:
Physical Review A 85, 062325 (2012)
We study how quantum walks can be used to find structural anomalies in graphs via several examples. Two of our examples are based on star graphs, graphs with a single central vertex to which the other vertices, which we call external vertices, are co
Externí odkaz:
http://arxiv.org/abs/1206.6298
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 45 (2012) 154006
A sequence of controlled collisions between a quantum system and its environment (composed of a set of quantum objects) naturally simulates (with arbitrary precision) any Markovian quantum dynamics of the system under consideration. In this paper we
Externí odkaz:
http://arxiv.org/abs/1202.6315
Publikováno v:
Physical Review A 84, 022331 (2011)
We present a number of schemes that use quantum mechanics to preserve privacy, in particular, we show that entangled quantum states can be useful in maintaining privacy. We further develop our original proposal [see Phys. Lett. A 349, 75 (2006)] for
Externí odkaz:
http://arxiv.org/abs/1108.5090
Publikováno v:
Phys. Rev. A 84(3), 032326 (2011)
Given an unknown state of a qudit that has already been measured optimally, can one still extract any information about the original unknown state? Clearly, after a maximally informative measurement, the state of the system `collapses' into a post-me
Externí odkaz:
http://arxiv.org/abs/1105.5326
Publikováno v:
Phys. Rev. A 83, 012313 (2011)
We propose a scheme for unambiguous state comparison (USC) of two unknown squeezed vacuum states of an electromagnetic field. Our setup is based on linear optical elements and photon-number detectors, and achieves optimal USC in an ideal case of unit
Externí odkaz:
http://arxiv.org/abs/1010.2937