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  • News
    Can the causal order between events change in quantum mechanics?
    09.04.2018
    conditions can this happen? Answers to these questions would be remarkable, because they would shed light on the nature of causality in the quantum world. In a recent paper, published in the journal Physical Review X, a group of physicists led by Časlav Brukner at the University of Vienna and the Vienna Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences showed that, if the dynamics of causal structures is continuous and reversible, a ...
  • News
    TURBO FÜR QUANTENRECHNUNGEN
    17.06.2022
    zu nutzen. Damit ist der Weg frei, um das Prinzip mit Experimenten praktisch nutzbar zu machen. “Wir haben ein spezielles Problem gefunden, das sich auf diese Weise nutzen lässt. Damit haben wir bewiesen, dass das grundsätzlich möglich ist," sagt Brukner, der von einer weiteren Übertragbarkeit und Anwendbarkeit dieses Prinzips überzeugt ist. Die Forscher konnten darüber hinaus sogar bestimmen, wie groß der Geschwindigkeitsvorteil ist, wenn die Reihenfolge der Rechenschritte ...
  • News
    In a quantum race everyone is both a winner and a loser
    29.03.2017
    physicists led by Philip Walther at the University of Vienna have implemented a new measurement, called a "causal witness", which allows them to watch Alice win and lose at the same time. This exciting measurement technique was designed by Caslav Brukner’s theory group at the Austrian Academy of Sciences. Formally, a causal witness is a mathematical tool to determine whether it is possible to describe an experiment without having to resort to superimposed orders. Using this ...
  • Event
    The case for quantum probabilism
    17.10.2024
    09.45-10.30 M. Müller (Vienna) Thinking twice inside the box: is Wigner’s friend really about quantum theory? 10.30-11.15 B. Dakić (Vienna) From classical to quantum: Revisiting Kolmogorov probability theory for a unified framework 11.15-12.00 Č. Brukner (Vienna) Incompatible probabilities in quantum mechanics with finite resources 12.00-12.30 Discussion
  • News
    Invitation to a talk: Shin-Liang Chen, Friday, May 11th 2018, 3 pm
    11.05.2018
    operation assisted by classical communication monotone (1W-LOCC monotone), but also corresponds the usefulness a quantum information processing task, i.e., the subchannel discrimination problem. Friday, May 11th, 2018 3:00 pm Room 3417 (PhD room, Brukner’s group), 4th floor Boltzmanngasse 5, 1090 Vienna Hosted by: Costantino Budroni
  • Event
    Towards understanding causality in fixed and indefinite space-times
    12.11.2019
    “local order” assumption in a framework independent manner. This comparison also reveals the differences between the optical (fixed space-time) and the gravitational (indefinite space- time) implementations of QS. References [1] Oreshkov O, Costa F, Brukner, Č. Quantum correlations with no causal order. Nature Commun. 3 1092 (2012). [2] Portmann, C., Matt, C., Maurer, U., Renner, R. & Tackmann, B. Causal Boxes: Quantum Information-Processing Systems Closed under Composition. ...
  • News
    Hans-Thirring Prize for Peter Asenbaum and Fabio Costa
    19.12.2014
    to prepare and observe freely rotating silicon nanorods. Advancing the current techniques will be crucial for future quantum coherence experiments with nanoparticles. Dr. Fabio Costa Local and Causal Structures in Quantum Theory Supervisor: Caslav Brukner ABSTRACT Quantum mechanics challenges the view that physical properties exist prior to and independent of their observation. Yet, basic notions such as locality or causality are still grounded on a realistic concept of ...
  • Event
    From GHZ to Tic Tac Toe: A Symposium to celebrate Danny Greenberger’s 90th birthday
    27.09.2023
    on Space" 14:10 - 14:50: Berge Englert "Waves, particles, and indeterminacy" 14:50 - 15:30: Michael Raymer "Ye Olde Quantum Measurement Problem" 15:30 - 16:00: Break 16:00 - 16:45: Adan Cabello "The missing GHZ correlation" 16:45 - 17:30: Caslav Brukner "The GHZ theorem for Wigner and his friends" 17:30 - 18:30: Wigner Medal Award Ceremony Friday, September 29 10:00 - 10:40: Markus Arndt " Challenges and applications of universal matter-wave interferometry " 10:40 - 11:20: ...
  • News
    How quantum particles see space-time?
    14.08.2018
    has been much debated. As a prerequisite for the debate is rigorous formulation of Einstein’s equivalence principle in quantum theory. In the latest issue of the journal Nature Physics, Magdalena Zych from the University of Queensland and Časlav Brukner from the University of Vienna and the Institute for Quantum Optics and Quantum Information (IQOQI-Vienna), formulated a quantum version of Einstein’s fundamental principle and proposed experiments to test it. We can now ...
  • News
    Is the past (and future) there when nobody looks?
    14.05.2021
    n to observe the result of a measurement? Can an observer always trust what they see and use this data to make predictions about future measurements? In their recent paper published in Communications Physics, a team of researchers, led by Caslav Brukner, from the University of Vienna, the Institute of Quantum Optics and Quantum Information (IQOQI-Vienna) of the Austrian Academy of Sciences and the Perimeter Institute for Theoretical Physics investigate the limits that ...