10 research outputs found
Microwave Electronics
Contains reports on three research projects.Office of Naval Research (Contract Nonr 1841(05)Purchase Order DDL-B15
Design, Fabrication, and Experimental Demonstration of Junction Surface Ion Traps
We present the design, fabrication, and experimental implementation of
surface ion traps with Y-shaped junctions. The traps are designed to minimize
the pseudopotential variations in the junction region at the symmetric
intersection of three linear segments. We experimentally demonstrate robust
linear and junction shuttling with greater than one million round-trip shuttles
without ion loss. By minimizing the direct line of sight between trapped ions
and dielectric surfaces, negligible day-to-day and trap-to-trap variations are
observed. In addition to high-fidelity single-ion shuttling, multiple-ion
chains survive splitting, ion-position swapping, and recombining routines. The
development of two-dimensional trapping structures is an important milestone
for ion-trap quantum computing and quantum simulations.Comment: 9 pages, 6 figure
Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning
Laser-cleaning of the electrodes in a planar micro-fabricated ion trap has
been attempted using ns pulses from a tripled Nd:YAG laser at 355nm. The effect
of the laser pulses at several energy density levels has been tested by
measuring the heating rate of a single 40Ca+ trapped ion as a function of its
secular frequency. A reduction of the electric-field noise spectral density by
~50% has been observed and a change in the frequency dependence also noticed.
This is the first reported experiment where the "anomalous heating" phenomenon
has been reduced by removing the source as opposed to reducing its thermal
driving by cryogenic cooling. This technique may open the way to better control
of the electrode surface quality in ion microtraps
Integration of fluorescence collection optics with a microfabricated surface electrode ion trap
We have successfully demonstrated an integrated optical system for collecting
the fluorescence from a trapped ion. The system, consisting of an array of
transmissive, dielectric micro-optics and an optical fiber array, has been
intimately incorporated into the ion-trapping chip without negatively impacting
trapping performance. Epoxies, vacuum feedthrough, and optical component
materials were carefully chosen so that they did not degrade the vacuum
environment, and we have demonstrated light detection as well as ion trapping
and shuttling behavior comparable to trapping chips without integrated optics,
with no modification to the control voltages of the trapping chip.Comment: 14 pages, 12 figure