Resultats globals: 15 registres trobats en 0.02 segons.
Articles, 6 registres trobats
Llibres i col·leccions, 6 registres trobats
Documents de recerca, 3 registres trobats
Articles 6 registres trobats  
1.
17 p, 1.6 MB Witnessing entanglement by proxy / Bäuml, Stefan (Universitat Autònoma de Barcelona. Departament de Física) ; Bruß, Dagmar (Heinrich-Heine-Universität Düsseldorf) ; Huber, Marcus (Universitat Autònoma de Barcelona. Departament de Física) ; Kampermann, Hermann (Heinrich-Heine-Universität Düsseldorf) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Entanglement is a ubiquitous feature of low temperature systems and believed to be highly relevant for the dynamics of condensed matter properties and quantum computation even at higher temperatures. [...]
2016 - 10.1088/1367-2630/18/1/015002
New Journal of Physics, Vol. 18 (January 2016) , art. 15002  
2.
2 p, 440.8 KB Generació ràpida de pseudo-atzar quàntic i les seves aplicacions en les ciències quàntiques / Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Utilitzar computadors quàntics per generar dades aleatòries seria costosíssim i lent. No obstant això, els físics consideren una alternativa, l'ús de pseudo-atzar quàntic. Andreas Winter, del Departament de Física, al costat de investigadors de Tòquio i altres col·laboradors, han publicat una sèrie d'articles on proposen un nou mètode, senzill i ràpid, per generar pseudo-atzar quàntic. [...]
2017
UAB divulga, Novembre 2017, p. 1-2  
3.
3 p, 611.0 KB Dinàmiques no-lineals per al processament quàntic de la informació / Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Investigadors del Departament de Física exploren una classe de transformacions d'estats quàntics fora del món lineal, que només requereix d'una font d'estats no gaussians i operacions lineals senzilles. [...]
2017
UAB divulga, Novembre 2017, p. 1-3  
4.
6 p, 528.3 KB Generalized laws of thermodynamics in the presence of correlations / Bera, Manabendra N. (Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques) ; Riera, Arnau (Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques) ; Lewenstein, Maciej (Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
The laws of thermodynamics, despite their wide range of applicability, are known to break down when systems are correlated with their environments. Here we generalize thermodynamics to physical scenarios which allow presence of correlations, including those where strong correlations are present. [...]
2017 - 10.1038/s41467-017-02370-x
Nature communications, Vol. 8 (2017) , art. 2180
2 documents
5.
19 p, 513.4 KB Equilibration time scales of physically relevant observables / García-Pintos, Luis Pedro (University of Bristol. School of Mathematics) ; Linden, Noah (University of Bristol. School of Mathematics) ; Malabarba, Artur S. L. (Chapman University. Institute for Quantum Studies) ; Short, Anthony J. (Chapman University. Institute for Quantum Studies) ; Winter, Andreas (Institució Catalana de Recerca i Estudis Avançats)
We address the problem of understanding, from first principles, the conditions under which a quantum system equilibrates rapidly with respect to a concrete observable. On the one hand, previously known general upper bounds on the time scales of equilibration were unrealistically long, with times scaling linearly with the dimension of the Hilbert space. [...]
2017 - 10.1103/PhysRevX.7.031027
Physical Review X, Vol. 7, issue 3 (Aug. 2017) , e031027  
6.
16 p, 581.4 KB Decoupling with random diagonal unitaries / Nakata, Yoshifumi (Universitat Autònoma de Barcelona. Departament de Física) ; Hirche, Christoph (Universitat Autònoma de Barcelona. Departament de Física) ; Morgan, Ciara (Universität Leipzig (1991- ). Institut für Theoretische Physik) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
We investigate decoupling, one of the most important primitives in quantum Shannon theory, by replacing the uniformly distributed random unitaries commonly used to achieve the protocol, with repeated applications of random unitaries diagonal in the Pauli-Z and -X bases. [...]
2017 - 10.22331/q-2017-07-21-18
Quantum, Vol. 1 (2017) , p. 18  

Llibres i col·leccions 6 registres trobats  
1.
15 p, 522.5 KB The quantum entropy cone of stabiliser states / Linden, Noah (University of Bristol. School of Mathematics) ; Matúš, František (Academy of Sciences of the Czech Republic) ; Ruskai, Mary Beth (Tufts University) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
We investigate the universal linear inequalities that hold for the von Neumann entropies in a multi-party system, prepared in a stabiliser state. We demonstrate here that entropy vectors for stabiliser states satisfy, in addition to the classic inequalities, a type of linear rank inequalities associated with the combinatorial structure of normal subgroups of certain matrix groups. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2013 (Leibniz International Proceedings in Informatics (LIPIcs) ; 22) - 10.4230/LIPIcs.TQC.2013.270
8th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2013), 2013, p. 270-284  
2.
4 p, 341.0 KB Bounds on entanglement assisted source-channel coding via the lovász number and its variants / Cubitt, Toby (University of Cambridge) ; Mančinska, Laura (National University of Singapore) ; Roberson, David (Nanyang Technological University) ; Severini, Simone (University College London) ; Stahlke, Dan (Carnegie Mellon University) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
We study zero-error entanglement assisted source-channel coding (communication in the presence of side information). Adapting a technique of Beigi, we show that such coding requires existence of a set of vectors satisfying orthogonality conditions related to suitably defined graphs G and H. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2014 (Leibniz International Proceedings in Informatics (LIPIcs) ; 27) - 10.4230/LIPIcs.TQC.2014.48
9th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2014), 2014, p. 48-51  
3.
15 p, 473.5 KB Strong converse for the quantum capacity of the erasure channel for almost all codes / Wilde, Mark M. (Louisiana State University. Department of Physics and Astronomy) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
A strong converse theorem for channel capacity establishes that the error probability in any communication scheme for a given channel necessarily tends to one if the rate of communication exceeds the channel's capacity. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2014 (Leibniz International Proceedings in Informatics (LIPIcs) ; 27) - 10.4230/LIPIcs.TQC.2014.52
9th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2014), 2014, p. 52-66  
4.
11 p, 443.2 KB Quantum learning of classical stochastic processes : The completely-positive realization problem / Monras Blasi, Àlex (Universitat Autònoma de Barcelona. Departament de Física) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Among several tasks in Machine Learning, is the problem of inferring the latent variables of a system and their causal relations with the observed behavior. A paradigmatic instance of such problem is the task of inferring the Hidden Markov Model underlying a given stochastic process. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2014 (Leibniz International Proceedings in Informatics (LIPIcs) ; 27) - 10.4230/LIPIcs.TQC.2014.99
9th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2014), 2014, p. 99-109  
5.
15 p, 532.3 KB Implementing unitary 2-designs using random diagonal-unitary matrices / Nakata, Yoshifumi (Leibniz Universität Hannover) ; Hirche, Christoph (Leibniz Universität Hannover) ; Morgan, Ciara (Leibniz Universität Hannover) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Unitary 2-designs are random unitary matrices which, in contrast to their Haar-distributed counterparts, have been shown to be efficiently realized by quantum circuits. Most notably, unitary 2-designs are known to achieve decoupling, a fundamental primitive of paramount importance in quantum Shannon theory. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2015 (Leibniz International Proceedings in Informatics (LIPIcs) ; 44) - 10.4230/LIPIcs.TQC.2015.191
10th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2015), 2015, p. 191-205  
6.
11 p, 583.0 KB Quantum enhancement of randomness distribution / Garcia Patron, Raul (Université Libre de Bruxelles) ; Matthews, William (University of Cambridge. Department of Applied Mathematics Theoretical Physics) ; Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
The capability of a given channel to transmit information is, a priori, distinct from its capability to distribute random correlations. Despite that, for classical channels, the capacity to distribute information and randomness turns out to be the same, even with the assistance of auxiliary communication. [...]
Dagstuhl : Leibniz-Zentrum fuer Informatik, 2015 (Leibniz International Proceedings in Informatics (LIPIcs) ; 44) - 10.4230/LIPIcs.TQC.2015.180
10th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2015), 2015, p. 180-190  

Documents de recerca 3 registres trobats  
1.
372 p, 2.4 MB Non-classical correlations in quantum mechanics and beyond / Lami, Ludovico, autor. ; Winter, Andreas, supervisor acadèmic. ; Universitat Autònoma de Barcelona. Departament de Física.
Aquesta tesis parteix d'una pregunta aparentment ingènua: Què passa si es separen dos sistemes físics que estaven en contacte? Un dels descobriments més rellevants del segle passat és que els sistemes que obeeixen les lleis de la mecànica quàntica, en comptes de les lleis clàssiques, romanen intrínsecament connectats fins i tot quan estan separats físicament. [...]
Esta tesis versa sobre una cuestión aparentemente naíf: ¿qué ocurre cuando se separan dos sistemas físicos que estaban juntos previamente? Uno de los mayores descubrimientos del siglo pasado es que los sistemas que obedecen leyes mecano-cuánticas, en lugar de clásicas, permanecen ligados inextricablemente incluso tras haber sido separados físicamente, un fenómeno conocido como entrelazamiento. [...]
This thesis is concerned with a seemingly naive question: what happens when you separate two physical systems that were previously together? One of the greatest discovery of the last century is that systems that obey quantum me- chanical instead of classical laws remain inextricably linked even after they are physically separated, a phenomenon known as entanglement. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2017.  
2.
105 p, 2.0 MB Correlations in the generalized bloch picture & applications in entanglement detection and quantum thermodynamics / Klöckl, Claude ; Winter, Andreas, dir. ; Huber, Marcus, dir. ; Universitat Autònoma de Barcelona. Departament de Física
La tesis doctoral resume generalizaciones posibles de la famosa imagen de Bloch y su correspondencia con los generadores del SU(d). En adicion a la obra establecida, propuestamos una nueva base aplicable a sistemas de n-qudit por uso en la imagen de Bloch. [...]
The thesis summarizes possible generalizations of the well-known Bloch picture and its connections to the generators of the SU(d). In addition to the established work we propose a new basis applicable to n-qudit systems for use in the Bloch picture. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2016  
3.
213 p, 2.0 MB High dimension and symmetries in quantum information theory / Lancien, Cécilia ; Winter, Andreas, dir. ; Aubrun, Guillaume, dir. ; Universitat Autònoma de Barcelona. Departament de Física
En unas palabras, el tema de esta tesis se podría resumir como: fenómenos varios en alta (pero finita) dimensión en teoría cuántica de la información. Dicho esto, sin embargo podemos dar algunos detalles de más. [...]
S'il fallait résumer le sujet de cette thèse en une expression, cela pourrait être quelque chose comme: phénomènes de grande dimension (mais néanmoins finie) en théorie quantique de l'information. [...]
If a one-phrase summary of the subject of this thesis were required, it would be something like: miscellaneous large (but finite) dimensional phenomena in quantum information theory. That said, it could nonetheless be helpful to briefly elaborate. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2016  

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