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  • News
    Article "Logical independence and quantum randomness" featured as a highlight in Europhysics News
    26.05.2010
    T Paterek, J Kofler, R Prevedel, P Klimek, M Aspelmeyer, A Zeilinger and C Brukner Logical independence and quantum randomness Europhysik News Vol. 41 No. 2 (March-April 2010) Abstract: We propose a link between logical independence and quantum physics. We demonstrate that quantum systems in the eigenstates of Pauli group operators are capable of encoding mathematical axioms and show that Pauli group quantum measurements are capable of revealing whether or not a given ...
  • Event
    Reverse processes as Bayesian retrodiction
    13.09.2023
    as Bayesian retrodiction, implemented by the Petz recovery map in quantum theory. Most of the talk will be spent in introducing this new approach and its tools [1-2]. Specific research results obtained in the framework will be mentioned at the end [3-6]. [1] F. Buscemi, V. S., PRE 103, 052111 (2021) https://arxiv.org/abs/2009.02849 [2] C.C. Aw, F. Buscemi, V. S., AVS Quantum Sci. 3, 045601 (2021) https://arxiv.org/abs/2106.08589 [3] C.C. Aw, K. Onggandinata, D. Kaszlikowski, ...
  • News
    Invitation to a talk: Wolfgang Wieland
    25.07.2017
    fact, the area of a two-dimensional cross section has a discrete spectrum, and no spin-networks or SU(2) variables are ever required for deriving this result. Finally, I present a proposal for how to formulate the dynamics for discretised gravity in terms of these variables as topological field theory on a system of internal null boundaries. Tuesday, July 25th, 2017 17:00h IQOQI Seminar Room, 2 nd Floor, Boltzmanngasse 3, 1090 Vienna Speaker: Wolfgang Wieland (Perimeter ...
  • Event
    Single phonon optomechanics with superfluid Helium: Precision tests of linearity in massive quantum systems
    23.11.2023
    photon detectors to probe the motional states of a superfluid Helium-4 resonator of mass ~ 1 ng. The arrival times of Stokes and anti-Stokes photons (scattered by the resonator’s acoustic mode) are used to measure the resonator’s phonon coherences [2]. With the mechanical resonator initialized to a coherent state (displaced thermal state of mean phonon number ~ 40,000 and phonon number variance ~ 1), a sensitive precision measurement of its coherence allows us to bound such ...
  • News
    Why and how “History for Physics”
    04.06.2025
    to the general public and to the students. While for the former purpose history focuses mostly on inspirational anecdotes, the latter has the role of forming a full-fledged quasi-historical narrative to create an internal ideology for the community [2]. As remarked by the prominent Danish historian of science Helge Kragh, this working history of physics “is of the same type as the national or religious history that gives to people a common national background or a common ...
  • Event
    Quantum Geometry, Observables and Symmetry-Resolved Entanglement
    27.03.2023
    In this talk, I consider a simple model of quantum geometry - the quantum polyhedron - and show how SU(2) symmetry-resolved observables define diffeomorphism-invariant regions, together with a precise notion of geometric entanglement entropy. The model illustrates in a concrete way the interplay of symmetries, observables and entanglement.
  • News
    Tanja Traxler - Why we lack female physicists – and what to do about it
    27.05.2020
    critical perspective on the underrepresentation of women in science, e.g. in a radio speech in 1953 she admitted: ‘Only later I realized how thankful especially women who are working in academic jobs should be to those women who have fought for equality.’[2] The slow increase of female scientists In Austria, the universities of Vienna, Graz, and Innsbruck allowed female students in the philosophical faculty from 1897 on. When Lise Meitner began her studies in physics in ...
  • Event
    Semiconductor-based sources of single and highly-entangled photons
    27.06.2019
    In this talk, we will focus on GaAs QDs in AlGaAs matrix [1,2], which show a unique combination of appealing features: fast radiative rates of ~5 GHz, capability of generating near perfectly entangled photon pairs [3] with good indistinguishability [4], ultralow multiphoton emission probability [5], high brightness [6], as well as a wavelength (~800 nm) suitable for free-space quantum communication and Silicon-based single-photon detectors. Some of these properties were ...
  • Event
    Persistence and Reidentification in Systems of Identical Quantum Particles: Towards a Post-Atomistic Conception of Matter
    28.06.2023
    require special mathematical treatment, and this only in the quantum mechanical (as opposed to classical mechanical) setting. Here, on the basis of a conceptual analysis of a recent mathematical reconstruction of the quantum symmetrization procedure [1, 2], I argue that the need for the symmetrization procedure originates in the confluence of identicality and the active nature of the quantum measurement process [3]. I propose a conception in which detection-events are ...
  • Event
    Bounding the set of correlations in sequential scenarios with SDP
    14.06.2019
    Under the assumption on the dimension of communicated system we propose modification of the semi-definite-programming (SDP) hierarchy of Navascués-Vértesi [PRL 115 (2), 2015] that allows for approximation of the set of correlations in the considered scenarios. The variants of the scenarios that we consider include state preparation of one party and two subsequent measurements, three sequential measurements with time dependent operations and two channels followed by a ...