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SUMMARY:Beyond the quantum - Antony Valentini (Imperial College)
DTSTART:20101111T141500Z
DTEND:20101111T151500Z
UID:TALK26330@talks.cam.ac.uk
CONTACT:Ashley Montanaro
DESCRIPTION:According to the pilot-wave theory of de Broglie and Bohm (a '
 hidden-variables theory')\, quantum physics is a special 'equilibrium' cas
 e of a much wider 'nonequilibrium' physics. This wider physics\, which may
  have existed in the early universe\, allows for superluminal signalling a
 nd violations of the uncertainty principle. Relativity\, too\, emerges onl
 y in the equilibrium state. After a brief account of the search for violat
 ions of quantum mechanics in a cosmological context (on the assumption tha
 t the universe started out in a state of 'quantum nonequilibrium')\, we ad
 dress the consequences of this wider physics for quantum information and c
 omputation. Standard protocols for quantum key distribution become insecur
 e\, but rigorous consequences for computation remain to be worked out.
LOCATION:MR4\, Centre for Mathematical Sciences
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