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  • Event
    Two models for the theory of decoherence
    20.03.2024
    to embrace a more general point of view, and try to answer the two following questions as universally as possible, i.e. without specifying any Hamiltonian: 1. What is the typical size of an environment needed to entail proper decoherence on a system? 2. Why is the universe not frozen by the quantum Zeno effect?
  • News
    Reinhard F. Werner
    08.04.2016
    have something that you can comfortably adapt to the journal profile, by all means send it to PRL or Nature. I will certainly continue to do this, if only for the benefit of my young co-authors. But don’t neglect writing full length scientific papers[ 2 ], containing all the technical detail needed for other researchers to actually build on your results, and also to detect possible flaws. This is the kind of “peer review” that really matters to science, much more so than the ...
  • Event
    Invitation to a talk: Lorenzo Maccone, Wednesday, May 9th 2018, 16:00 at the IQOQI Seminar Room
    09.05.2018
    correct statistics of sequential measurements performed on a system at different times. Our proposal is based in Page and Wootters’ and on Aharonov and Kaufherr’s conditional probabilities mechanism. Wednesday, May 9, 2018 16:00 h IQOQI Seminar Room, 2nd Floor, Boltzmanngasse 3, 1090 Vienna Hosted by: Časlav Brukner
  • News
    Paul Halpern
    02.11.2016
    individual in the setting of his time. Those of you based in Vienna or within traveling distance will have the opportunity to hear Paul Halpern speak on that same subject and meet him in person at the occasion of the Inaugural Award Ceremony of the Award on 2 December 2016. We are particularly pleased to be able to welcome him in Vienna in person then. The Book Too Painful To Complete: Interpreting the Life of Paul Ehrenfest By Paul Halpern Sometimes, if the fate of its ...
  • Event
    Towards understanding causality in fixed and indefinite space-times
    12.11.2019
    matrix framework. However, modelling this assumption using measurements of local clocks to order these events could decohere the process being considered. To this effect, I will compare two frameworks for studying causality: the causal boxes framework [2] and the process matrix framework. The former assumes a fixed background space-time, while the latter does not, yet both can describe the quantum switch (QS) which is claimed to be an example of an indefinite causal order. ...
  • News
    Invitation to a talk by Marko Vojinovic on Tuesday, November 7th 2017, 12:00h at the IQOQI Seminar Room
    07.11.2017
    study the causal order of events in various background gravitational fields. The RQG model will then enable us to discuss situations where the causal order between two events is not uniquely defined. Tuesday, November 7, 2017 12:00 h IQOQI Seminar Room, 2nd Floor, Boltzmanngasse 3, 1090 Vienna Hosted by: Caslav Brukner
  • Event
    Probabilistic exact construction of decoders from encoding black boxes
    04.07.2022
    D-dimensional system, we propose a universal isometry inversion protocol that constructs a decoder from multiple calls of the encoding operation. This is a probabilistic but exact protocol whose success probability is independent of D. For a qubit (d=2) encoded in n qubits, our protocol achieves an exponential improvement over any tomography-based or unitary-embedding method, which cannot avoid D-dependence. We also discover a fundamental difference between isometry ...
  • Event
    Anyonic information theory and quantum foundations
    12.01.2023
    First, the theory of 2+1 D non-abelian anyons will be introduced. The newly discovered notion of anyonic creation operators will be presented, as well as their use as local elements of reality within the Deutsch-Hayden interpretation of quantum mechanics. The relationship between anyonic systems and quantum reference frames will be explored, concretely in the area of subsystem relativity. Lastly, I will present the strange properties of anyonic entanglement, such as the ...
  • News
    Can we see quantum correlations at the macroscopic scale?
    20.09.2021
    mechanics to classical mechanics is the coarse-graining mechanism [2]: if measurements performed on macroscopic systems have limited resolution and cannot resolve individual microscopic particles, then the results behave classically. Such an argument, applied to (nonlocal) Bell correlations [3], leads to the principle of macroscopic locality [4]. Similarly, temporal quantum correlations reduce to classical correlations ( macroscopic realism) [2] and quantum contextuality ...
  • News
    Invitation to a talk: Jordan Colter, Monday, July 9th 2018, 3 pm at the IQOQI Seminar Room
    09.07.2018
    diagnostic of one subsystem causally influencing another, and explore a variety of examples. The superdensity operator formalism is used to uncover interesting structural properties of local causal influence. Monday, July 9, 2018 3:00 pm IQOQI Seminar room, 2nd floor Boltzmanngasse 3, 1090 Vienna Hosted by: Časlav Brukner