BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Bell and Leggett-Garg inequalities in tests of local and macroscop
 ic realism
DTSTART;VALUE=DATE-TIME:20130625T093000Z
DTEND;VALUE=DATE-TIME:20130625T103000Z
DTSTAMP;VALUE=DATE-TIME:20260705T023750Z
UID:indico-event-1926@indico.ific.uv.es
DESCRIPTION:Quantum physics is in conflict with a classical world view bot
 h conceptually and mathematically. The assumptions of a genuine classical 
 world – local realism and macroscopic realism – are at variance with q
 uantum mechanical predictions as characterized by the violation of experim
 entally testable inequalities. While Bell’s inequality is used to demons
 trate quantum entanglement between two or more quantum systems that are di
 stant in space\, the Leggett-Garg inequality was designed to witness quant
 um superpositions of macroscopic objects. The former phenomenon – quantu
 m entanglement – is of great importance for the new field of quantum inf
 ormation science\, where it is used in quantum cryptography or quantum com
 putation. The latter – macroscopic superpositions (“Schrödinger cats
 ”) – is not yet experimentally verified and is intimately linked to th
 e famous measurement problem and the quantum-to-classical transition. In t
 his talk\, I will discuss some recent results regarding conceptual issues 
 in Bell tests [1\,2] (which are also important for security proofs in quan
 tum cryptography)\, foundational entanglement experiments [3-4]\, as well 
 as theoretical developments of the Leggett-Garg inequality [5-7]. This pav
 es the way towards a completely loophole-free Bell test and towards witnes
 sing quantum superpositions in more and more macroscopic and complex syste
 ms\, potentially in biological organisms. [1] T. Scheidl\, R. Ursin\, J. K
 ofler\, S. Ramelow\, X. Ma\, T. Herbst\, L. Ratschbacher\, A. Fedrizzi\, N
 . Langford\, T. Jennewein\, and A. Zeilinger\, PNAS 107\, 19708 (2010) [2]
  M. Giustina\, A. Mech\, S. Ramelow\, B. Wittmann\, J. Kofler\, A. Lita\, 
 B. Calkins\, T. Gerrits\, S. W. Nam\, R. Ursin\, and A. Zeilinger\, Nature
  497\, 227 (2013) [3] X. Ma\, T. Herbst\, T. Scheidl\, D. Wang\, S. Kropat
 schek\, W. Naylor\, A. Mech\, B. Wittmann\, J. Kofler\, E. Anisimova\, V. 
 Makarov\, T. Jennewein\, R. Ursin\, and A. Zeilinger\, Nature 489\, 269 (2
 012) [4] X. Ma\, S. Zotter\, J. Kofler\, R. Ursin\, T. Jennewein\, Č. Bru
 kner\, and A. Zeilinger\, Nature Phys. 8\, 480 (2012) [5] J. Kofler and Č
 . Brukner\, Phys. Rev. Lett. 99\, 180403 (2007) [6] J. Kofler and Č. Bruk
 ner\, Phys. Rev. Lett. 101\, 090403 (2008) [7] J. Kofler and Č. Brukner\,
  Phys. Rev. A 87\, 052115 (2013)\n\nhttps://indico.ific.uv.es/event/1926/
LOCATION:Dpto. de Física Teórica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1926/
END:VEVENT
END:VCALENDAR