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  • 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, wh
  • News
    Quantum learning chosen for IOP Select
    18.11.2009
    The speed of quantum and classical learning for performing the kth root of NOT Abstract: We consider quantum learning machines—quantum computersthat modify themselves in order to improve their perform
  • News
    Quantum times: when did the cuckoo sing?
    29.05.2020
    We are used to the fact that events are sharply localised in time. In a cuckoo clock, the cuckoo always calls at a precise time. Everybody looking at the clock would agree on this. However, a team of physicists led by Caslav Brukner from the University of Vienna and the Austrian Academy of Sciences showed that, when quantum mechanics and Einstein’s general relativity are combined, this might no longer be the case. When time “goes quantum” the temporal localisability of events becomes relative. In quantum times, the cuckoo can call at a precise time according to one observer, but some other observers might be totally uncertain about the time when it sings.
  • Seite
    Macroscopic Entanglement Witnesses
    entanglement in the solids. [1] Č. Brukner and V. Vedral, Macroscopic Thermodynamical Witnesses of Quantum Entanglement, Preprint at quant-ph/0406040 . [2] Č. Brukner, V. Vedral and A. Zeilinger, Crucial Role of Quantum Entanglement in Bulk Properties of Solids, Phys. Rev. A 73 , 012110 (2006) . [3] M. Wiesniak. V. Vedral and Č. Brukner, Magnetic Susceptibility as Macroscopic Entanglement Witness, New J. Phys. 7 , 258 (2005) . [4] M. Wieśniak, V. Vedral, and Č. Brukner, Heat ...
  • Seite
    Gravitational Quantum Physics
    F. Costa, Č. Brukner, Universal decoherence due to gravitational time dilation, Nature Phys. 11, 668–672 (2015) M. Zych, Č. Brukner, Quantum formulation of the Einstein equivalence principle. Nature Phys 14, 1027–1031 (2018) Bibliography [1] M. Zych, F. Costa, I. Pikovski, Č. Brukner, Quantum interferometric visibility as a witness of general relativistic proper time, Nat. Commun. 2 :505 doi: 10.1038/ncomms1498 (2011) . [2] M. Zych, F. Costa, I. Pikovski, T. C. Ralph and Č.  ...
  • Seite
    Quantum Theory on Indefinite Causal Structures
    A. Feix, and Č. Brukner, The simplest causal inequalities and their violation, New J. Phys. 18 , 013008 (2016). [4] M. Araujo, F. Costa, Č. Brukner, Computational advantage from quantum-controlled ordering of gates, Phys. Rev. Lett. 113 , 250402 (2014) . Editor's Choice [5] P. A. Guérin, A. Feix, M. Araújo and Č. Brukner, Exponential Communication Complexity Advantage from Quantum Superposition of the Direction of Communication, Phys. Rev. Lett. 117 , 100502 (2016) . [6] Č.  ...
  • Seite
    Quantum Communication Complexity
    of Quant. Inf. 4 , 365 (2006) . Preprint at quant-ph/0509123 . [4] P. A. Guérin, A. Feix, M. Araújo and Č. Brukner, Exponential Communication Complexity Advantage from Quantum Superposition of the Direction of Communication, Phys. Rev. Lett. 117 , 100502 (2016) . Brukner Group Caslav Brukner Stellv. Institutsdirektor Gruppenleiter +43 (1) 4277 - 72582 Caslav.Brukner(at)oeaw.ac.at Luca Apadula Doktorand Luca.Apadula(at)oeaw.ac.at Eduardo Barbosa Oliveira Visiting PhD Student ...
  • Seite
    Bell’s Inequalities
    [1] M. Zukowski and Č. Brukner, Bell’s Theorem for General N-qubit States, Phys. Rev. Lett. 88 , 210401 (2002) . [2] M. Zukowski, Č. Brukner, W. Laskowski and M. Wiesniak, Do All Pure Entangled States Violate Bell’s Inequalities for Correlation Functions?, Phys. Rev. Lett. 88 , 210402 (2002). [3] W. Laskowski, T. Paterek, M. Zukowski and Č. Brukner, Tight Multipartite Bell’s Inequalities Involving Many Measurement Settings, Phys. Rev. Lett. 93 , 200401 (2004) . [4] Č. Brukne ...
  • Seite
    Quantum-to-Classical Transition
    anymore from the delta function, and one arrives at deterministic predictions. [1] J. Kofler and Č. Brukner, Classical World Arising out of Quantum Physics under the Restriction of Coarse-grained Measurements, Phys. Rev. Lett. 99 , 180403 (2007) . [2] J. Kofler and Č. Brukner, Conditions for Quantum Violation of Macroscopic Realism, Phys. Rev. Lett. 101 , 090403 (2008) . [3] J. Kofler and Č. Brukner, Condition for Macroscopic Realism beyond the Leggett-Garg Inequalities, ...
  • Seite
    Information-Theoretic Foundations of Quantum Theory
    also applies to intermediate cases of partial knowledge (red axes). [1] Č. Brukner and A. Zeilinger, Operationally Invariant Information in Quantum Measurements, Phys. Rev. Lett. 83, 3354 (1999) . [2] Č. Brukner and A. Zeilinger, Information and Fundamental Elements of the Structure of Quantum Theory, in “Time, Quantum, Information ”, Ed. L. Castell and O Ischebeck (Springer, 2003). Preprint at quant-ph/0212084 . [3] Č. Brukner and A. Zeilinger, Information Invariance and ...