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UID:814@lincs.fr
DTSTART;TZID=Europe/Paris:20240207T140000
DTEND;TZID=Europe/Paris:20240207T150000
DTSTAMP:20240226T103802Z
URL:https://www.lincs.fr/events/bell-theorem-and-the-role-of-complex-numbe
 rs-in-quantum-information-theory/
SUMMARY:Bell theorem and the role of complex numbers in quantum information
 theory
DESCRIPTION:Quantum information theory has several puzzling properties. In
 particular\, it predicts that information carried by quantum objects is
 incompatible with the use of the logical ‘or’.\n\nWhile in our
 intuition of the world\, a cat hidden in a box can be dead or alive\,
 according to quantum mechanics this assertion is not valid anymore. Hence\,
 we need a new concept: we say that a quantum cat can be dead  ‘and’
 alive.\n\nThis new concept is however hard to accept: couldn’t we imagine
 a new theory replacing quantum information theory and compatible again
 with  our stadard logical ‘or’?\n\nIn 1964\, Bell proved that\, in
 some sense\, this puzzling feature of quantum theory is a necessity: there
 does not exist any ‘reasonable’ theory of information (which would
 replace quantum information theory) compatible with this logical
 ‘or’.\n\nBell’s seminal proof is based on quantum correlations\,
 which are obtained when multiple parties perform independent measurements
 on a shared quantum state.\n\nI’ll first review this Bell theorem\, and
 discuss some of its main consequences for the foundations of physics and
 the more philosophical notion of determinism and randomness.\n\nThen\, I
 will discuss recent generalization of this theorem which were obtained in
 the context of quantum networks\, in which multiple parties perform
 independent measurements on several\, independent quantum states.\n\nIn
 particular\, I’ll show that Real Quantum Theory (the theory obtained
 replacing complex by real numbers in standard Quantum Information Theory)
 can be ruled out by a Bell-like experiment.\n\nThis talk is based on "La
 non-localité quantique à l’ère des réseaux\, Marc Olivier Renou\,
 Nicolas Brunner et Nicolas Gisin\, POUR LA SCIENCE N° 528 (20 septembre
 2021)" and "Les nombres imaginaires sont indispensables à la théorie
 quantique pour décrire le monde\, Marc-Olivier Renou\, Antonio Acin et
 Miguel Navascués\, POUR LA SCIENCE N° 551\, 30 août
 2023"\n\nBio:\nMarc-Olivier research focuses onquantum networks and
 distributed computing\, quantum protocols based on quantum correlations and
 the\nfoundations of quantum information theory. He obtained his PhD from
 Geneva university in 2019 (under the supervision of Nicolas
 Gisin).\n\nAfter a postdoc at ICFO (Barcelona\, Spain)\, he joined Inria
 Saclay in 2023.
CATEGORIES:Seminars,Youtube
LOCATION:Room 4B01\, 19 place Marguerite Perey\, Palaiseau\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=19 place Marguerite Perey\,
 Palaiseau\, France;X-APPLE-RADIUS=100;X-TITLE=Room 4B01:geo:0,0
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TZID:Europe/Paris
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DTSTART:20231029T020000
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