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SUMMARY:The Closeting of Secrets - Professor Adrian Kent\, University of C
 ambridge
DTSTART:20230203T173000Z
DTEND:20230203T183000Z
UID:TALK172136@talks.cam.ac.uk
CONTACT:Janet Gibson
DESCRIPTION:The definition and properties of information may seem to be fu
 ndamental features of the world that are independent of how particles\, fi
 elds and space-time behave. In fact\, though\, information is fundamentall
 y physical and twentieth century physics has radically changed our underst
 anding of its nature and properties. Einstein's relativity theories tell u
 s that information cannot travel faster than the speed of light in vacuum.
  Quantum theory tells us that the information carried by microscopic syste
 ms is qualitatively different from the familiar ``classical'' information 
 with which we presently communicate and compute: for example\, quantum inf
 ormation cannot be copied. These realisations have led to new applications
  and emerging new technologies\, including relativistic quantum cryptograp
 hy and new forms of quantum communication and computation in space-time. T
 his lecture will illustrate several ways in which physics-based cryptograp
 hy and communication allow otherwise unachievable forms of security and fl
 exibility\, including guaranteeing a fair coin toss for mistrustful partie
 s\, making and later revealing secret predictions that carry a guaranteed 
 time stamp\, and secure forms of money that emulate quantum particles by f
 ollowing multiple paths and recombining to solve otherwise insoluble tradi
 ng problems. We will also ask how confident we should be that we now fully
  understand how information is carried and processed in nature\, and wheth
 er new physics discoveries might yet change our understanding and lead to 
 further technological advances.\n\nAdrian Kent is Professor of Quantum Phy
 sics at the Department of Applied Mathematics and Theoretical Physics\, Un
 iversity of Cambridge\, a Fellow of Wolfson College and Director of Studie
 s in Mathematics at Darwin College.    He is also a Distinguished Visiting
  Research Chair at Perimeter Institute for Theoretical Physics\, Fellow of
  the UK Institute of Physics\, Founder Member of the Foundational Question
 s Institute and Charter Honorary Fellow of the John Bell Institute for the
  Foundations of Physics.   Adrian’s research interests include the natur
 e of physical reality\, fundamental tests of quantum theory and its relati
 onship to gravity\, the properties of quantum information in space-time\, 
 and applications of fundamental physics to new forms of quantum and relati
 vistic cryptography\, communication and computation.    
LOCATION:Lady Mitchell Hall\, Sidgwick Avenue
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