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  • Event
    About fluctuating systems with nonreciprocal interactions
    15.07.2024
    only inflate, as in equilibrium criticality, but also develop an asymptotically increasing time-reversal asymmetry [2]. Second, we introduce nonreciprocal coupling in the XY model, where nonreciprocity can lead to the formation of true long-range order [3], but can also induce spatiotemporal chaos that can be regarded as a source of self-generated noise. [1] Loos and Klapp, NJP (2020). [2] Suchanek, Kroy, and Loos, PRE (2023), PRE (2023), and PRL (2023). [3] Loos, Klapp, and ...
  • Event
    Towards a test of the Quantum equivalence principle
    05.08.2021
    etric setup that employs atomic clocks to observe a superposition of gravitational time dilations. I showed that this system can test some features of the quantum equivalence principle, employing the framework of spacetime quantum reference frames [2], namely quantum reference frames associated to particles that have both external and internal degrees of freedom. Finally, I will talk about how gravitational time dilation enhances some gravity-related measurements performed ...
  • 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 ...
  • News
    Job Announcements of our Strategic Partner - International Center for Theory of Quantum Technologies
    19.09.2018
    1. Call for applications for Group Leader for the research group Quantum Cybersecurity and Communication - https://euraxess.ec.europa.eu/jobs/335676 [1] 2. Call for applications for Group Leader for the research group New Quantum Resources II - https://euraxess.ec.europa.eu/jobs/336975 [2] 3. Call for applications for Group Leader for the research group Quantum Open Systems - https://euraxess.ec.europa.eu/jobs/336981 [3] 4. Call for applications for Group Leader for the ...
  • Event
    Flat space/spacetime from Quantum Mechanics
    09.10.2024
    ideas, we report on two extensions of this result [2-4]: how the metric structure of the Euclidean 3-space and of the flat Minkowski space can be recovered in the classical limit from quantum mechanics using only the observables of abstract (algebraic form of) quantum mechanics. [1] R. Penrose, Combinatorial quantum theory and quantized directions, in {\it Advances in Twistor Theory}, Eds. L. P. Houghston, R. S. Ward, Pitman Publishing Ltd, London 1979 [2] L. B. Szabados, A ...
  • 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 ...
  • 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, ...
  • 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.
  • 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 ...