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  • Seite
    Generalized Contextuality in Large Quantum Systems
    Transformations, and Unsharp Measurements , Phys. Rev. A 71 , 052108 (2005). [2] M. P. Müller and A. J. P. Garner, Testing Quantum Theory by Generalizing Noncontextuality, Phys. Rev. X 13, 041001 (2023). DOI: 10.1103/PhysRevX.13.041001 . [3] M. D. Mazurek, M. F. Pusey, K. J. Resch, and R. W. Spekkens, Experimentally Bounding Deviations From Quantum Theory in the Landscape of Generalized Probabilistic Theories , PRX Quantum 2 , 020302 (2021). Müller Group Markus Müller ...
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    Beyond quantum theory
    the last result implies that there exist information-theoretic physical principles which are unstable under composition. For any such principle Q , there exists a pair of boxes P 1 , P 2 such that infinitely many copies of one or the other are compatible with Q , but no physical theory can contain both P 1 and P 2 while satisfying Q . Therefore expressions such as “the set of all correlations satisfying the principle of Information Causality”, widely used in foundations of ...
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    Quantum Cryptography with High-Dimensional and Many-Party Entanglement
    work: F. Brandt, M. Hiekkamäki, F. Bouchard, M. Huber, and R. Fickler, High-dimensional quantum gates using full-field spatial modes of photons. Optica, 7(2), 98-107 (2020). [1] J. Bouda, M. Pawłowski, M. Pivoluska, M. Plesch, Device-independent randomness extraction from an arbitrarily weak min-entropy source, Phys. Rev. A 90 , 032313 (2014) . [2] M. Pivoluska and M. Plesch, Device Independent Random Number Generation, Acta Physica Slovaca 64, No.6, 600 – 663 (2014) . [3] ...
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    Quantum Science and Application in Biology
    applications can have a significant contribution. For example, quantum coherence has been suggested to explain the high efficiency of photosynthesis [1] or quantum-imaging methods can potentially be exploited as a means of future imaging and microscopy [2]. Image adopted from “la dioptrique” book from Descartes and modified. We are aiming to develop tools, which can assist us approaching the answer to our curiosity and fundamental questions in physics and biology. An example ...
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    Practical Information
    ferry and a local bus to Argostoli is also available. Accommodation and food The workshop will take place in a neighborhood complex in the village of Tselentata on the Greek island of Kefalonia. The participants will be accommodated in shared rooms (2-3 people), and share sanitary services. Main meals will be provided by local restaurants (vegetarian and vegan options will be available). Breakfast and snacks will also be available at the workshop’s location, and self ...
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    Process matrix correlations
    set of possible process matrices. Fig. 1 Conditional probabilities from process matrices. Depicted is the two-party case. [1] O. Oreshkov, F. Costa, and Č. Brukner, "Quantum correlations with no causal order", Nature Communications 3, 1092 (2012). [2] C. Branciard, M. Araújo, A. Feix, F. Costa and Č. Brukner, “The simplest causal inequalities and their violation”, New J. Phys. 18, 013008 (2016). [3] M. Araújo, A. Feix, M. Navascués and Č. Brukner, "A purification postulate ...
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    Asenbaum Group
    create quantum entanglement mediated just by gravity and, therefore, demonstrate the quantum nature of gravity [2-5]. PhD and PostDoc positions available! References [1] C. Overstreet † / P. Asenbaum † , M. Kim, J. Curti, M. A. Kasevich, Observation of a gravitational Aharonov-Bohm effect, Science 375, 226 (2022) https://www.science.org/doi/10.1126/science.abl7152 References [Other Groups] [2] C. Marletto, V. Vedral, Gravitationally Induced Entanglement between Two Massive ...
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    Information-Theoretic Foundations of Quantum Theory
    Motivated by Wheeler’s idea of “it from bit” – the idea that information is the most fundamental, basic entity – we formulated one of the first proposals for an “information-theoretic” approach to quantum theory in 1999 [1,2]. The basic idea is that every quantum system is associated with a finite amount of information. Alternatively, one can say that the most elementary system carries one bit of information, as represented by the truth value of an elementary proposition. An ...
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    Controlling the world
    imagination and mental capacity of the human agents who conceive the policies. If the optimal policy of lockdowns and vaccinations required to contain a disease happens to be extremely complex, then it is unlikely to be discovered through this process. In [2] we frame the task of finding suitable government policies for disease control as an optimization problem. In this problem, there is an objective function to be considered (e.g.: the total number of days under lockdown), ...
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    Memory in temporal correlations
    A notion of “classical'' temporal correlations correlations has been proposed by Leggett and Garg [1,2], based on the assumption of the existence of a definite value for physical properties at any time ( realism ) and the possibility of measurements that do not affect the subsequent evolution of such physical properties ( noninvasive measurability ). These classical models, called macrorealist admit bounds on the correlations observed in temporal sequences, the Leggett-Garg ...