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  • News
    Quanten-Sprünge zwischen Top-Universitäten
    12.07.2013
    Fünftel“, erklärt Robert Bücker. Optische Transistoren: Unterschiedliche Varianten Die Herstellung von optischen Resonatoren ist ein langgehegter Traum in der Quantenphysik: Solche Bauteile könnten für künftige Computer-Generationen höchst interessant sein und uns möglicherweise dem Quanten-Computer einen Schritt näherbringen. Erst kürzlich konnte die TU Wien einen optischen Transistor präsentieren . Dieses Modell funktioniert für einen breiten Bereich an Wellenlängen im ...
  • Event
    The Role of Error and Imagination in the Making of Science: The Case of the Non-Cloning Theorem
    25.09.2023
    relativity, most referees couldn’t find the mistake. Peres decided then to publish the paper anyway, the end result being, according to Kaiser (2011), the discovery by Wojciech Zurek and Bill Wootters of the so-called non-cloning theorem of quantum computation. I will present in my talk this story and what we can learn about science from it. This lecture will be based on original not yet published primary sources, secondary sources and on an interview I carried out with Nick ...
  • News
    New insights into the remote control of quantum systems
    29.08.2012
    accordingly, regardless of how far apart the two entangled particles might be. This feature allows for the remote quantum state preparation, which is an essential ingredient for applications in quantum communication, quantum cryptography, and quantum computation. The degree of entanglement is often used as a figure of merit for determining its usefulness for quantum technologies. Strongly entangled systems, however, are very sensitive to extrinsic influence and difficult to ...
  • News
    HEADING TOWARDS ENTROPY TICK-BY-TICK
    03.08.2017
    Every tick has a fundamental entropy cost. The whole concept presently only exists as a computer simulation. How can one imagine a “perfect clock” concretely? Huber: Our thought experiment shows that clocks are essentially machines that harness a tendency of out-of-equilibrium resources to tend to equilibrium. They use this process to produce measurable “ticks”. In our mathematical model used in the computer simulation, our clock operates using two thermal reservoirs at ...
  • News
    Elegant measurements in Bell experiments prove efficient for quantum communication
    11.02.2021
    for harvesting and revealing quantum phenomena in the laboratory. Therefore, sophisticated manipulation of quantum measurements is at the heart of the most groundbreaking applications of quantum physics, such as quantum cryptography and quantum computation, as well as at the heart of the most well-known features of quantum theory. Quantum theory features a variety of types of measurements, that implement different ways of extracting information from a physical system. In the ...
  • News
    Quantum physics: entanglement is more intractable than expected
    26.05.2020
    Entanglement is one of the fundamental concepts of quantum mechanics, and it plays a fundamental role in many promising technologies, from quantum computers to quantum cryptography. However, proving the presence of entanglement between two components of an experiment is not always an easy task. "In many experiments, a special situation in which the two components are maximally entangled is employed. In the case of two photons, for example, this can be a special superposition ...
  • News
    Three "twisted" photons in three dimensions
    11.03.2016
    it became impossible to ascertain where a particular photon came from. Besides serving as a test bed for studying many fundamental concepts in quantum mechanics, multi-photon entangled states such as these have applications ranging from quantum computing to quantum encryption. Along these lines, the authors of this study have developed a new type of quantum cryptographic protocol using their state that allows different layers of information to be shared asymmetrically among ...
  • News
    Quantum causal relations: A causes B causes A
    03.10.2012
    Although it is still not known if such situations can be actually found in nature, the sheer possibility that they could exist may have far-reaching implications for the foundations of quantum mechanics, quantum gravity and quantum computing. Causal relations: who influences whom In everyday life and in classical physics, events are ordered in time: a cause can only influence an effect in its future not in its past. As a simple example, imagine a person, Alice, walking into ...
  • News
    VIENNESE RESEARCHERS DEMONSTRATE NEW CONCEPT OF MEASURING QUANTUM STATES
    16.07.2018
    group of Marcus Huber at the Institute for Quantum Optics and Quantum Information (IQOQI) Vienna of the Austrian Academy of Sciences (ÖAW). The interdisciplinary team, consisting of researchers with backgrounds in theoretical physics, mathematics, computer science, and experimental physics developed a new method for the certification of high-dimensional entanglement and successfully implemented it in a cutting-edge experiment, which they report in their publication in ...
  • News
    Do “Schrödinger cat-states” occur naturally
    15.12.2017
    systems and demonstrates that more sophisticated experimental techniques are needed for the preparation of a genuine MS. In addition, the presented methods and results find applications in quantum marginal related problems and adiabatic quantum computing. Macroscopic Superpositions as Quantum Ground States Borivoje Dakić and Milan Radonjić Phys. Rev. Lett. 119, 090401 – Published 1 September 2017