[MOS] April 1, 2008

[Zina Queen]

Seminar on
Modern Optics and Spectroscopy

Isaac Chuang,
MIT

Planar ion traps for quantum information science and spectroscopy

APRIL 1, 2008

12:00 - 1:00 p.m.
Grier Room 34-401

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.
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