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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3679
DTSTART:20150604T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T124346Z
LAST-MODIFIED:20150529T125352Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Steering many-body quantum dynamics\, R. G. Herb Condensed Mat
 ter Seminar\, Tommaso Calarco\, University of Ulm
DESCRIPTION:Quantum technologies are based on the manipulation of indi
 vidual degrees of freedom of quantum systems with exquisite precision.
  Achieving this in a real environment requires pushing to the limits t
 he ability to control the dynamics of quantum systems of increasing co
 mplexity. Optimal control techniques are known to enable steering the 
 dynamics of few-body systems in order to prepare a desired state or pe
 rform a desired unitary transformation. I will present a<br>
\nrecentl
 y developed optimal control method that allows doing so for a many-bod
 y quantum system undergoing e.g. a quantum phase transition in the non
 -adiabatic regime. This opens the way to a range of applications\, fro
 m the suppression of defects in a superfluid-Mott-insulator transition
  with ultra-cold atoms in an optical lattice to the achievement of var
 ious quantum gates at the quantum speed limit. I will present detailed
  calculations we performed for different<br>
\nexperimental scenario\,
  together with the corresponding results obtained by experimental grou
 ps in different fields\, from cold atoms to diamond NV centers. Our co
 ntrol method also allows for exploring more general questions like the
  complexity of reversing quantum many-body dynamics\, steering it back
  to its initial state even without the ability to revert the sign of t
 he whole Hamiltonian. I will conclude by showing some recent results w
 e obtained in this context\, as well as further questions opened by ou
 r investigations.
URL:https://www.physics.wisc.edu/events/?id=3679
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