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Showing 1–5 of 5 results
Advanced filters: Author: Roger Colbeck Clear advanced filters

  • Quantum-mechanical predictions are generally probabilistic. Here, assuming freely chosen measurements, it is shown that enhanced predictions are not possible and, thus, randomness is inherent in quantum theory: a result that has applications in fields such as quantum cryptography.

    • Roger Colbeck
    • Renato Renner
    ResearchOpen Access
    Nature Communications
    Volume: 2, P: 1-5

  • The Heisenberg uncertainty principle bounds the uncertainties about the outcomes of two incompatible measurements on a quantum particle. This bound, however, changes if a memory device is involved that stores quantum information. New work now extends the uncertainty principle to include the case of quantum memories, and should provide a guide for quantum information applications.

    • Mario Berta
    • Matthias Christandl
    • Renato Renner
    Research
    Nature Physics
    Volume: 6, P: 659-662

  • Bell’s equations enable scientists to test the fundamental implications of quantum physics. A central tenet of this idea is that the choice of measurement is truly random. Researchers now show that some Bell experiments can even increase randomness in cases where choice is not entirely free. The concept could increase the usefulness of weakly random sources for more thorough tests of quantum mechanics.

    • Roger Colbeck
    • Renato Renner
    Research
    Nature Physics
    Volume: 8, P: 450-453

  • The uncertainty principle tells us that two associated properties of a particle cannot be simultaneously known with infinite precision. However, if the particle is entangled with a quantum memory, the uncertainty of a measurement is reduced. This concept is now observed experimentally.

    • Robert Prevedel
    • Deny R. Hamel
    • Kevin J. Resch
    Research
    Nature Physics
    Volume: 7, P: 757-761