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  • 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 ...
  • 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 ...
  • News
    On the quantum nature of gravity
    14.05.2019
    The prize, assigned by the Gravity Research Foundation for the 70th time this year, awards the best and most well-written essays about gravitation, its theory, applications or effects. The contest, which awards prizes of up to $4,000, has been won by five people who won the Nobel Prize in physics. The awarded essay "Information Content of the Gravitational Field of a Quantum Superposition" considers the quantum aspects of gravitation. In fact, General Relativity and Quantum ...
  • News
    Interference as an information-theoretic game
    22.03.2021
    theory allows marbles to "pass through 2 tubes at the same time", each quantum marble is worth 2 pennies. The value of the tokens is additive: for example, in order to win the game, Alice can either insert 4 classical marbles or 2 quantum marbles, as the total token value is in both cases equal to 4 pennies", explains Sebastian Horvat. On the other hand, recall that a quantum particle cannot pass through more than two locations at the same time: this is reflected in the fact ...
  • 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
    Marcus Huber
    22.03.2017
    we never put any financial burden on the reader or author of any of our articles. While we do ask for a publication fee of 100-200€, this can be waived without explanation and all our articles are obviously free to read (and published using a CC BY 4.0 creative commons license). Good science is not about fancy headlines and impact factors: We have no target rejection rate and every paper is judged only on its own scientific merit. The expected number of citations is not even ...
  • 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 .
  • 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 ...