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SUMMARY:Quantum computing with electron spins in quantum dots - Dr. Lieven
  Vandersypen\, Delft
DTSTART:20060222T161500Z
DTEND:20060222T173000Z
UID:TALK4656@talks.cam.ac.uk
CONTACT:Duncan Simpson
DESCRIPTION:An electron spin in a quantum dot is a promising candidate rea
 lization of a quantum bit. In the last few years\, this promise is gradual
 ly coming true. Electrical single-shot read-out of the electron spin has n
 ow become routine in our lab. We have used this read-out capability to cha
 racterize the spin relaxation time\, finding T1's of the order of 1 ms\, p
 resumably dominated by the spin-orbit interaction. Furthermore\, from tran
 sport measurements through two dots in series\, we found that the electron
  spin dephases in a time as short as 25 ns\, due to the hyperfine interact
 ion with the nuclear spins in the substrate. Fortunately\, the nuclear dyn
 amics is very slow\, so the intrinsically long T2 of electron spins can be
  recovered via spin-echo-style techniques\, as demonstrated by the Harvard
  group. Finally\, we have very recently observed magnetic resonance of the
  electron spins in a double quantum dot\, by applying microwaves on-resona
 nce with the Zeeman splitting.\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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