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SUMMARY:Information scrambling and quantum advantage in quantum simulation
  - Andrew Daley (Oxford)
DTSTART:20241113T160000Z
DTEND:20241113T170000Z
UID:TALK221695@talks.cam.ac.uk
CONTACT:Lucas Sá
DESCRIPTION:There has been impressive recent progress in controlling many-
 particle quantum systems\, ranging from superconducting qubits to neutral 
 atoms in tweezer arrays. In the applications of these systems to both quan
 tum metrology and quantum simulation\, there are important questions aroun
 d how large an entangled many-body state we can usefully and reliably prep
 are in the presence of decoherence. Entanglement growth is typically limit
 ed by Lieb-Robinson bounds on how fast information can spread\, so that th
 e useful system size with short-range interactions will grow only linearly
  with the coherence time of the system. However\, for systems with long-ra
 nge interactions (e.g.\, atoms in cavities) or movable tweezer arrays\, we
  can engineer so-called fast scrambling dynamics\, where information is sp
 read and entanglement is built up on a timescale that grows logarithmicall
 y with the system size.  I will give an introduction to these ideas and to
  some of our recent studies of quantum information scrambling\, including 
 how transitions to so-called fast scrambling can be observed in neutral at
 om arrays\, with applications in generating useful entangled states for me
 trology. I will also discuss how this relates to questions of when analogu
 e devices can be quantitatively reliable and operating in regimes that are
  inaccessible to conventional supercomputers.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, J.J. Thomson Avenu
 e
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