Combs and isotopic customization for trapped ion quantum computing (Prof. W. Campbell)
14:30 - 15:30
Prof. Dr. Wesley C. Campbell
UCLA Physics and Astronomy, University of California Los Angeles, USA
New Lecture Hall, Room B 0.32
Since ions bind their valence electrons tightly, the light needed to work with them is often in the UV part of the spectrum, where laser light is difficult to produce and manage.
We have pursued two
avenues in an attempt to address this problem. First, we will discuss how
optical frequency combs may be employed to ease the creation of
short-wavelength light. We find that, when illuminated by a comb, trapped ions
can behave as a phonon laser whose gain saturation protects them from being
boiled out of the trap by the hundreds of blue-detuned comb teeth present.
Second, in collaboration with Eric Hudson's group at UCLA, we describe work
with barium ions, the species with the longest-wavelength transitions among the
obvious choices. We discuss why creating a particular radioactive isotope
endows Ba+ with the atomic structure advantages of more-difficult species and
position it as a flexible, easy to use, all purpose qubit.