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  • News
    Gravitational SL(2, ℝ) algebra on the light cone
    05.08.2021
    symmetries of the boundary fields are manifest. We identify the gauge generators and second-class constraints that remove the auxiliary variables. All gauge generators are at most quadratic in the fundamental SL(2 , ℝ) variables on phase space. We compute the Dirac bracket and identify the Dirac observables on the light cone. Finally, we discuss various truncations to quantise the system in an effective way.
  • News
    Gravitational SL(2, ℝ) algebra on the light cone
    03.08.2021
    symmetries of the boundary fields are manifest. We identify the gauge generators and second-class constraints that remove the auxiliary variables. All gauge generators are at most quadratic in the fundamental SL(2 , ℝ) variables on phase space. We compute the Dirac bracket and identify the Dirac observables on the light cone. Finally, we discuss various truncations to quantise the system in an effective way.
  • News
    IQOQI Vienna launches "Young Independent Researcher Group"
    10.01.2019
    programme will investigate the notion of causality in quantum theory as well as post-quantum theories and theories of computation. Do the laws of quantum mechanics facilitate our ability to discern causal relations; what kind of problems would a computer be able to solve if it could admit non-causal processes? The project will work at the interface of quantum physics and computer science to address concrete questions related to time keeping devices and causal order. Within ...
  • News
    Causality in the Quantum World
    03.04.2019
    caused by it. In elaborate quantum experiments, however, researchers are creating situations in which the relationship between cause and effect between events is no longer clearly defined. The findings could be useful for more efficient computations on quantum computers and provide new insights into the interface of quantum physics and general relativity. https://www.spektrum.de/magazin/kausalitaet-in-der-quantenwelt/1626454
  • News
    Daniel Greenberger
    14.04.2014
    had both good and bad consequences. When computers first become conscious, it is likely that we will do the same, although this might be a dangerous alternative. But it is also likely that we will be totally at a loss to understand the true nature of computer consciousness, since we cannot even understand our own. We can build a primitive “morality” into the computer by giving it a set of rules by which to live, such as “thou shalt not lie”. But as the computer becomes more ...
  • Event
    Quantum Communication with Noisy Devices
    19.10.2021
    regarding the practical relevance of quantum channel coding remain open. In the presented work, we initiate the study of these questions and show how techniques from quantum computation and communication can be combined to arrive at a communication analog of the famous threshold theorem. The threshold theorem says that one can compute (and now also communicate), when the noise per gate is below a certain threshold. We expect our results to be relevant for satellite ...
  • Event
    From Quantum in Pictures to practical Natural Language Processing, Music, and understandable AI.
    04.04.2023
    language, and much of the high-level reasoning that goes on in our brain can be shaped according to those pictures. One consequence of this is that natural language really wants to live on a quantum computer, which is something that we meanwhile realised [3], and we have also made music with quantum computers [4]. All our software developed for doing so, lambeq and Quanthoven respectively, is freely available from GitHub, open-source, and well-documented and well-supported. ...
  • News
    Paul Ehrenfest Award 2016
    02.08.2017
    we use pseudo-randomness produced by Turing machines or true randomness. To prove their point, the authors identify situations in which ensembles of quantum states defining the same mixed state become arbitrarily distinguishable when prepared by a computer. Their work also points out a new loophole in the violation of Bell inequalities, stemming from the use of pseudorandom number generators to choose the measurement settings.
  • News
    Proving quantum entanglement with only a few questions
    25.06.2019
    Quantum computation has been drawing the attention of many scientists because of its potential to outperform the capabilities of standard computers for certain tasks. For the realization of a quantum computer, one of the most essential features is quantum entanglement. This describes an effect in which several quantum particles are interconnected in a complex way. If one of the entangled particles is influenced by an external measurement, the state of the other entangled ...
  • Event
    Thermodynamics of Predictive and Retrodictive Complexity
    16.03.2022
    This dissipation depends explicitly on the logical architecture of the information ratchet's memory and leads to general principles of computational design, helping us navigate a vast array of possible implementations of the same computation. Notably, when absorbing a patterned process as input and transforming it into random uncorrelated outputs, the modularity dissipation is minimized and work production is maximized if and only if the ratchet's memory contains the ...