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  • Event
    Invitation to a talk by Frederic Schuller on Monday, January 29th 2018, 12:00 h
    29.01.2018
    but also their dynamical evolution. This notably includes very exotic backgrounds. Being able to consider matter coupling to geometries far beyond Lorentzian metrics is not too bad a perspective, in face of our having detailed knowledge of of only 4.6\% of the matter-energy dynamics (including their geometric background) in the universe. And not a new perspective either, considering that it was the dynamics of the classical electromagnetic field which single-handedly led ...
  • Event
    Single phonon optomechanics with superfluid Helium: Precision tests of linearity in massive quantum systems
    23.11.2023
    nonlinearities in the modified Schrodinger equation for massive quantum systems [1]. I will describe our experimental work that (incidentally) probes such a hypothesis. We use single 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 ...
  • News
    History for Physics: Quantum Gravity
    03.10.2019
    please contact the organizers, who will then try to match tandems together. We also highly welcome history talks by non-historians. If you wish to contribute in one of those ways, please send an abstract of your proposed talk, no longer than half an A4 page, to hfp@mpiwg-berlin.mpg.de . The deadline for applications is 01.11.2019. Besides the talks, we will schedule a panel discussion on the relevance of the history of physics for research and education and its current ...
  • News
    FELIX EHRENHAFT: A DISONANT VOICE FROM VIENNA – OR THE COST OF BEING AGAINST PARADIGMS
    02.02.2021
    allowed him to measure the electron charge, for which he won international prestige, achieving an accuracy superior to other scientists, as Robert Millikan. However, his fame declined as Ehrenhaft insisted on having also found fraction values, like 2/3 or 4/3 of the “elementary” charge. He seemed with this result to side with Ernst Mach, in terms of denying the electron the status of an indivisible particle. He fought with the Austrian artillery during Word War I, and ...
  • Event
    General relativity does not admit enough observables
    28.11.2022
    observables. That is, whether the family of all diffeomorphism-invariant, real-valued, smooth maps on the space Ein(M) of all Einstein metrics on M is rich enough to separate all physical spacetimes. So far the only smooth observables known (when M=R^4) are the constant maps. In this talk, we will illustrate how descriptive set theory provides a convenient framework for framing and answering the problem of observables in the negative. I will then demonstrate an uncountable ...
  • News
    Transgressing the disciplinary boundaries: Ernst Mach
    17.06.2020
    theory of relativity (as acknowledged by Einstein himself), as well as for being the main adversary of Ludwig Boltzmann in the debate about the reality of atoms (the latter narrative has however recently been much scaled down by historians, see [3,4]). Moreover, despite he called himself a “holiday sportsman” (“Sonntagsjäger”) in philosophy, Mach has in fact been one the leading figures of the Viennese philosophical landscape, being a prime influence on the intellectual ...
  • News
    2018 PAUL EHRENFEST BEST PAPER AWARD FOR QUANTUM FOUNDATIONS
    02.10.2019
    Scarani, Centre for Quantum Technologies, Singapore Markus Mueller, IQOQI Vienna, Austrian Academy of Sciences Markus Mueller coordinated the selection process at IQOQI Vienna and is looking forward to inviting you to the award ceremony on December 4th at the Faculty of Physics/University of Vienna, please see the invitation here .
  • News
    Invitation to a talk by Pavel Kroupa on Wednesday, December 6th 2017, 16:00h
    06.12.2017
    ly from the LCDM one. Milgromian dynamics predicts a new physical phenomenon, the external field effect, and it is shown that astronomical data indeed bear evidence for this phenomenon, which is strictly non-Newtonian. Wednesday, December 6th, 2017 4:00 PM IQOQI Seminar Room, 2nd Floor, Boltzmanngasse 3, 1090 Vienna Hosted by: Anton Zeilinger
  • Event
    Robustness of Magic and Symmetries of the Stabiliser Polytope
    29.08.2018
    scales subexponentially with the number of injected magic states - better than a naive analysis would suggest. However, determining the robustness of n copies of a magic state is difficult, as its definition involves a convex optimisation problem in a 4^n-dimensional space. In this paper, we make use of inherent symmetries to reduce the problem to n dimensions. The total run-time of our algorithm, while still exponential in n, is super-polynomially faster than previously ...
  • News
    Can we see quantum correlations at the macroscopic scale?
    20.09.2021
    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 reduces to macroscopic non-contextuality [5]. It was strongly believed that the ...