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SUMMARY:Harnessing cold atoms to empower quantum technologies  - Dr Marco 
 Koshorreck\, University of Bonn
DTSTART:20140506T104500Z
DTEND:20140506T114500Z
UID:TALK52461@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:The ability to control the internal and external degrees of fr
 eedom of individual or ensembles of atoms has been breathtaking in the las
 t three decades. Nowadays\, laser cooled atoms and degenerate quantum gase
 s are almost routinely produced in many laboratories all over the world. T
 his rapid development has produced a tremendous interest in utilizing atom
 ic systems to explore their quantum properties in technological applicatio
 ns such as quantum information processing\, quantum sensing\, and quantum 
 computation. \nI will present experiments that demonstrate a few of those 
 quantum technologies: \nFirst\, a quantum metrology application of optical
 ly trapped and laser-cooled rubidium 87 atoms is presented. Where\, we hav
 e been able to produce a spin squeezed state of an ensemble of one million
  atoms\, which shows a twofold sensitivity enhancement compared to the sta
 ndard quantum limit.\nSecond\, two-dimensional Fermi gases of ultracold po
 tassium 40 atoms serve as a quantum simulator for many-body physics in two
  dimensions. As an example\, the physics of a single fermionic spin impuri
 ty in a fermionic bath is studied and the defining properties of the emerg
 ent quasi-particle – the Fermi polaron – are determined. Further\, the
  limits of spin diffusion are explored for a strongly interacting two-dime
 nsional Fermi gas and we observe the lowest spin diffusivity ever measured
 .\nIn the end\, will outline a possible quantum information platform based
  on single neutral atom strongly coupled to the electromagnetic field mode
  of nano-photonic structures.  \n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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