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  • Event
    Playing with Bob's toys to quantize gravity
    24.11.2022
    We recall the definition of Yutsis diagrams, a standard graphical calculus used in quantum chemistry and quantum gravity, and we show how it embeds within Penrose's binor calculus. Then we show how we can explicitly diagrammatically calculate 3jm, 4jm and 6j symbols with ZX-calculus. It has long been thought that quantum gravity should be closely aligned to quantum information theory. In this paper, we present a way in which this connection can be made exact, by writing the ...
  • Event
    Paul Ehrenfest Best Paper Award for Quantum Foundations
    27.04.2023
    hence opening the possibility for an experimental falsification of quantum theory based on real numbers." "Quantum theory based on real numbers can be experimentally falsified", Nature 600, 625 (2021), DOI: https://doi.org/10.1038/s41586-021-04160-4 Awarded by the members of the 2022 selection committee: Anne Broadbent, University of Ottawa, Canada Mohamed Bourennane, Stockholm University, Sweden Tracy Northup, University of Innsbruck, Austria Marcin Pawlowski, University ...
  • News
    Paul Feyerabend: Between Physics and Philosophy
    04.03.2021
    Atlantic Highlands (NJ) 1975 [second edition (revised): Verso: London and New York 1988; third edition (revised): Verso: London and New York 1993]. [4] Feyerabend, P.K. Killing Time: The Autobiography of Paul Feyerabend , University of Chicago Press: Chicago and London 1995. [5] Feyerabend, P.K. Physics and Philosophy: Philosophical Papers, Volume 4 , S. Gattei and J. Agassi (Eds.), Cambridge University Press: Cambridge 2016. [6] Feyerabend, P.K. and Popper, K.R. ...
  • Event
    Quantum mechanics can find a needle in a haystack every time
    23.06.2025
    H. van den Vlekkert, and J. J. Renema, Quantum 7, 1071 (2023). [2]. P. Senellart, G. Solomon, and A. G. White, Nature Nanotechnology 12, 1026–1039 (2017). [3]. L. K. Grover, Physical Review Letters 79, 325 (1997). [4]. T. Roy, L. Jiang, and D. I. Schuster, Physical Review Research 4, L022013 (2022). [5]. A. Fyrillas, O. Faure, N. Maring, J. Senellart, and N. Belabas, Optica 11, 427-436 (2024). [6]. F. Mohit, A. Roy, J. Guanzon, J. McKinlay, T. J. Weinhold, M. P. Almeida, M. ...
  • Event
    One-way States and Topology in Driven Nonlinear Mechanical Resonators
    28.02.2025
    chiral (one-way) amplification. Furthermore, I will cover how interfering two-mode squeezing and hopping interactions enable nonreciprocal transport without breaking time-reversal symmetry [3], linked to non-Hermitian topology in a bosonic Kitaev model [4]. Finally, I will extend the discussion to broader classes of driven-dissipative nonlinear systems and introduce a topological classification framework based on vector flow topology in phase space. By tuning driving ...
  • Event
    Weak-values techniques: when parameter estimation becomes easy
    01.12.2016
    Presenter : Julian Martinez-Rincon; University of Rochester Host : M. Aspelmeyer Where : Schrödingerroom, Boltzmanngasse 5, 4th floor, 1090 Wien Precision measurements are bounded by the Standard Quantum Limit (SQL), and preparing non-classical states is often used to circumvent such a limit. In all cases, it is common to improve the precision in a parameter estimation procedure by averaging measurements on a large ensemble of identically prepared systems. However, such a ...
  • Event
    Multispectral Optoacoustic Tomography for Clinical Applications
    28.11.2016
    Presenter : Alexander Urich; iThera Medical GmbH Host : CoQuS Where : Lise Meitner Hörsaal, Strudlhofgasse 4, 1st floor, Vienna Multispectral Optoacoustic Tomography (MSOT) is a novel biomedical imaging technology that utilizes the photoacoustic effect to visualize and quantify anatomical, functional and molecular information, in vivo, in deep tissue and in real time. Today, MSOT allows the study of disease processes on a molecular level as well as the analysis of ...
  • Event
    Interaction and Evolution in Classical Mechanics and in Quantum Mechanics, and Indefinite Causal Orders
    05.04.2023
    One gets for free, moreover, a characterization of "free" evolution (or "isolation"). This is not the case in Hamiltonian and quantum mechanics. Along the way, I point out that the theorems allow one to entirely reconstruct the full 4-dimensional spacetime structure of Newtonian physics from classical dynamics, again in a way not possible in quantum theory. Thus, it is also the case that the dynamics of quantum theory needs to be hooked up to background spacetime structure ...
  • News
    Video Abstract der Fakultät für Physik: Können wir mithilfe von Satelliten gravitationsbedingte Dekohärenz nachweisen?
    27.08.2014
    Video Abstract der Serie ist nun veröffentlicht. Dr. Jacques Pienaar stellt seine Publikation zu einem Test gravitationsbedingter Dekohärenz in einem Video Abstract vor. Das Video Abstract stammt von Dr. Jacques Pienaar (Gruppe Caslav Brukner). In knapp 4 Minuten fasst Dr. Pienaar die gemeinsame Forschung mit Professor Tim Ralph (University of Queensland, Australien) in einem Realfilm mit eingefügten Illustrationen zusammen. In ihrer Publikation, die kürzlich im New Journal ...
  • News
    On the quantum nature of gravity
    14.05.2019
    The prize, assigned by the Gravity Research Foundation for the 70th time this year, awards the best and most well-written essays about gravitation, its theory, applications or effects. The contest, which awards prizes of up to $4,000, has been won by five people who won the Nobel Prize in physics. The awarded essay "Information Content of the Gravitational Field of a Quantum Superposition" considers the quantum aspects of gravitation. In fact, General Relativity and Quantum ...