Browsing by Author "Acín dal Maschio, Antonio"

Now showing items 1-14 of 14

    • A Combinatorial Approach to Nonlocality and Contextuality 

      Acín dal Maschio, Antonio; Fritz, Tobias; Leverrier, Anthony (Springer, 2015-03-01)
      Article
      Open Access
      So far, most of the literature on (quantum) contextuality and the Kochen– Specker theorem seems either to concern particular examples of contextuality, or be considered as quantum logic. Here, we develop a general formalism ...

    • Almost quantum correlations 

      Navascués, Miguel; Guryanova, Yelena; Hoban, Matty J.; Acín dal Maschio, Antonio (Nature Publishing group, 2015-02-20)
      Article
      Open Access
      Quantum theory is not only successfully tested in laboratories every day but also constitutes a robust theoretical framework: small variations usually lead to implausible consequences, such as faster-than-light communication. ...

    • Detection loophole attacks on semi-device-independent quantum and classical protocols 

      Dall’Arno, Michele; Passaro, Elsa; Gallego, Rodrigo; Pawlowski, Marcin; Acín dal Maschio, Antonio (Rinton Press, 2015-01-01)
      Article
      Open Access
      Semi-device-independent quantum protocols realize information tasks – e.g. secure key distribution, random access coding, and randomness generation – in a scenario where no assumption on the internal working of the devices ...

    • Entanglement and Nonlocality are Inequivalent for Any Number of Parties 

      Augusiak, R.; Demianowicz, M.; Tura, J.; Acín dal Maschio, Antonio (APS, 2015-07-15)
      Article
      Open Access
      Understanding the relation between nonlocality and entanglement is one of the fundamental problems in quantum physics. In the bipartite case, it is known that these two phenomena are inequivalent, as there exist entangled ...

    • Entanglement preserving local thermalization 

      Hsieh, Chung Yun; Lostaglio, Matteo; Acín dal Maschio, Antonio (American Physical Society, 2020-03-30)
      Article
      Open Access
      We investigate whether entanglement can survive the thermalization of subsystems. We present two equivalent formulations of this problem: (1) Can two isolated agents, accessing only preshared randomness, locally thermalize ...

    • Inequivalence of entanglement, steering, and Bell nonlocality for general measurements 

      Quintino, Marco Tulio; Vértesi, Tamas; Cavalcanti, Daniel; Augusiak, Remigiusz; Demianowicz, Maciej; Acín dal Maschio, Antonio; Brunner, Nicolas (APS, 2015-09-08)
      Article
      Open Access
      Einstein-Podolsky-Rosen steering is a form of inseparability in quantum theory commonly acknowledged to be intermediate between entanglement and Bell nonlocality. However, this statement has so far only been proven for a ...

    • Maximally Nonlocal Theories Cannot Be Maximally Random 

      Torre, Gonzalo de la; Hoban, Matty J.; Dhara, Chirag; Prettico, Giuseppe; Acín dal Maschio, Antonio (APS, 2015-04-22)
      Article
      Open Access
      Correlations that violate a Bell inequality are said to be nonlocal; i.e., they do not admit a local and deterministic explanation. Great effort has been devoted to study how the amount of nonlocality (as measured by a ...

    • Nonlocality in many-body quantum systems detected with two-body correlators 

      Tura, J.; Augusiak, Remigiusz; Sainz, A. B.; Lücke, B.; Klempt, C.; Lewenstein, Maciej; Acín dal Maschio, Antonio (Science Direct, 2015-07-30)
      Article
      Open Access
      Contemporary understanding of correlations in quantum many-body systems and in quantum phase transitions is based to a large extent on the recent intensive studies of entanglement in many-body systems. In contrast, much ...

    • Optimal randomness generation from optical Bell experiments 

      Máttar, Ajenadro; Skrzypczyk, Paul; Brask, Jonatan Bohr; Cavalcanti, Daniel; Acín dal Maschio, Antonio (IOP, 2015-02-10)
      Article
      Open Access

    • Quantum channel marginal problem 

      Hsieh, Chung Yun; Lostaglio, Matteo; Acín dal Maschio, Antonio (American Physical Society, 2022-03-31)
      Article
      Open Access
      Given a set of local dynamics, are they compatible with a global dynamics? We systematically formulate these questions as quantum channel marginal problems. These problems are strongly connected to the generalization of ...

    • Quantum mechanics 

      Vilaseca Alavedra, Ramon; Acín dal Maschio, Antonio (2009-10-21)
      Audiovisual
      Open Access

    • Supersolid-superfluid phase separation in the extended Bose-Hubbard model 

      Kottmann, Korbinian Gebhard; Haller, Andreas; Acín dal Maschio, Antonio; Astrakharchik, Grigori; Lewenstein, Maciej (American Physical Society (APS), 2021-11-01)
      Article
      Open Access
      Recent studies have suggested a new phase in the extended Bose-Hubbard model in one dimension at integer filling. In this work, we show that this new phase is phase-separated into a supersolid and superfluid part, generated ...

    • Thermodynamic cost of creating correlations 

      Huber, Marcus; Perarnau-Llobet, Martí; Hovhannisyan, Karen V.; Skrzypczyk, Paul; Klöckl, Claude; Brunner, Nicolas; Acín dal Maschio, Antonio (IOP, 2015-06-10)
      Article
      Open Access
      We investigate the fundamental limitations imposed by thermodynamics for creating correlations. Considering a collection of initially uncorrelated thermal quantum systems, we ask how much classical and quantum correlations ...

    • Ultra-fast quantum randomness generation by accelerated phase diffusion in a pulsed laser diode 

      Abellán Cano, Carlos; Amaya, Waldimar; Jofre Cruanyes, Marc; Curty, M.; Acín dal Maschio, Antonio; Capmany, Jose; Pruneri, Valerio; Mitchell, Morgan W. (2014-01-27)
      Article
      Open Access
      We demonstrate a high bit-rate quantum random number generator by interferometric detection of phase diffusion in a gain-switched DFB laser diode. Gain switching at few-GHz frequencies produces a train of bright pulses ...