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  • News
    Invitation to a talk: Misha Woods, Wednesday March 14th 2018, 05:15 pm at the IQOQI Seminar Room
    14.03.2018
    classical clocks? In this talk, after introducing the notion of a finite dimensional quantum clock, we will study two related but different tasks: how well they can autonomously control another quantum system (e.g. perform the gates in a quantum computation) and how well they can tell the time by producing a periodic stream of “ticks”. For the former, we will prove they can do so while only enduring an exponentially small error in clock dimension and clock energy; while for ...
  • News
    How can we test whether quantum theory is false?
    06.10.2023
    of this: if experimental data admits only contextual classical models, then such models are implausible, and the physics can be said to be genuinely quantum. This notion of contextuality is necessary for quantum technological advantages such as computational speed-ups or more efficient ways to do metrology. Building on these insights, Garner and Müller have formulated a similar criterion for when an underlying quantum model is implausible. “We would really like to see this ...
  • News
    EINSTEIN DISPROVED BY 100,000 "BELLSTERS"
    09.05.2018
    Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences (ÖAW). More than 100,000 volunteers, so-called "Bellsters", on five continents participated in this experiment. In a specially designed online game, these Bellsters used their computers, tablets or smartphones to generate, arbitrarily and without influencing one another, more than 90 million zeros and ones. These numbers were then fed via experimental stations into a total of 12 quantum laboratories. ...
  • Event
    Coming full circle - A unified framework for Kochen-Specker contextuality
    13.05.2025
    Yet, despite its long recognised importance in quantum foundations and, more recently, in quantum computation, the mathematics of contextuality has remained somewhat elusive - different frameworks address different aspects of the phenomenon, yet their precise relationship often is unclear. In fact, there is a glaring discrepancy already between the original notion of contextuality introduced by Kochen and Specker on the one side [J. Math. Mech., 17, 59, (1967)], and the ...
  • Event
    A novel experimental platform for waveguide QED with cold atoms and photonic crystal waveguides
    23.05.2023
    endeavour, photonic crystals offer two main assets: slow light, which can enhance the atom-photon interaction, and band gaps, which can be used to form atom-photon bound states which can be resources for quantum simulation or variational quantum computing. However, implementing these waveguide QED platforms is challenging as they should combine facilitated optical access for atom transport and trapping via guided modes. In this presentation, I will emphasize a proposal and ...
  • News
    Borrowed time: researchers fast-forward and rewind quantum systems
    21.12.2020
    d quantum system forwards and backwards in time could be theoretically also used to perform calculations faster. Since the technique works for any quantum system, we could also use it to manipulate a quantum computer. However, this would require using multiple copies of the quantum computer. By borrowing time from the other copies, one of the copies could be fast-forwarded to a time when the desired calculations are already done. "From today's perspective, it is unlikely ...
  • News
    Hidden bridge between Quantum Experiments and Graph Theory uncovered using Melvin
    18.12.2017
    Phenomena of quantum physics are perfectly computable - but often elude human logic. In the future, it would be precisely computer algorithms that could make a decisive contribution to the solution of quantum-physical questions, where human logic does not get any further, as was demonstrated now by Melvin . The algorithm developed by researchers of the Austrian Academy of Sciences (ÖAW) and the University of Vienna is actually being created for the calculation of technical ...
  • News
    Forscher entwerfen Datenbus für Quantencomputer
    09.11.2017
    Quantencomputer werden in Zukunft Rechenaufgaben bewältigen, an denen herkömmliche Computer scheitern. Weil Objekte in der Quantenwelt aber sehr sensibel auf Störungen reagieren, sind der Umsetzung heute noch Grenzen gesetzt. Obwohl die Systeme mit hohem Aufwand gegenüber Umwelteinflüssen abgeschirmt werden, können bisher im Labor nur kleine Protoypen für Quantencomputer gebaut werden. Die Fehleranfälligkeit lässt sich reduzieren, indem die Quanteninformation nicht in einem ...
  • News
    Quantum gravity’s tangled time
    22.08.2019
    relevant for future quantum technologies. Quantum computers that exploit quantum order of performing operations might beat devices that operate using only fixed sequences. Practical implementations of quantum temporal order do not require extreme conditions—such as planets in superposition—and can be simulated without the use of gravity. The discovery of quantum properties of time can lead to better quantum devices in the upcoming era of quantum computers.
  • News
    Adaptive measurement strategies outperform current schemes for entanglement detection
    21.09.2021
    the core of the latest technological applications of quantum mechanics: it is, for instance, a necessary resource for cryptographic protocols such as quantum key distribution and a crucial property of the quantum states generated during a quantum computation. It thus comes as no surprise that a major theoretical and experimental effort is nowadays dedicated towards detecting and quantifying the entanglement of quantum systems. This is particularly challenging, when the ...