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<div><font face="Arial" color="#000000">Seminar on</font></div>
<div><font face="Arial" color="#000000"><b>Modern Optics and
Spectroscopy</b></font></div>
<div><font face="Arial" color="#000000"><b><br>
Isaac Chuang</b>,<br>
MIT<br>
<br>
<i><b>Planar ion traps for quantum information science and
spectroscopy<br>
<br>
</b></i>APRIL 1, 2008<br>
<br>
12:00 - 1:00 p.m.</font></div>
<div><font face="Arial" color="#000000">Grier Room 34-401<br>
<br>
</font><font face="Times New Roman" color="#000000">Recent experiments
demonstrate that ions can be trapped with electrodes on the surface of
microfabricated chips. This new generation of ion traps offers
the potential for sophisticated and selective control of trapped ions,
for applications in quantum information and spectroscopy.
However, rapid decoherence of motional states occurs in such traps,
when ions are confined d=100 micrometers or less from the surface, in
typical operation. This noise is given as a heating rate of
about 1000 quanta per second, which grows as d^{-4}, and is attributed
to local fluctuations of surface patch potentials. We present
new data on how cryogenic operation of d=75 micrometer gold-on-quartz
ion traps at 6 Kelvin leads to dramatic suppression of such ion
heating noise, to 1 quanta per second, and discuss how these long
coherence time traps may open new avenues to spectroscopy of molecular
ions.</font></div>
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