25 research outputs found
Continuous and Pulsed Quantum Zeno Effect
Continuous and pulsed quantum Zeno effects were observed using a Rb
Bose-Einstein condensate(BEC). Oscillations between two ground hyperfine states
of a magnetically trapped condensate, externally driven at a transition rate
, were suppressed by destructively measuring the population in one of
the states with resonant light. The suppression of the transition rate in the
two level system was quantified for pulsed measurements with a time interval
between pulses and continuous measurements with a scattering rate
. We observe that the continuous measurements exhibit the same
suppression in the transition rate as the pulsed measurements when
, in agreement with the predicted value of 4.
Increasing the measurement rate suppressed the transition rate down to
.Comment: 5 pages, 4 figure
Atom trapping with a thin magnetic film
We have created a Rb Bose-Einstein condensate in a magnetic trapping
potential produced by a hard disk platter written with a periodic pattern. Cold
atoms were loaded from an optical dipole trap and then cooled to BEC on the
surface with radiofrequency evaporation. Fragmentation of the atomic cloud due
to imperfections in the magnetic structure was observed at distances closer
than 40 m from the surface. Attempts to use the disk as an atom mirror
showed dispersive effects after reflection.Comment: 4 pages, 5 figure
Imaging of trapped ions with a microfabricated optic for quantum information processing
Trapped ions are a leading system for realizing quantum information processing (QIP). Most of the technologies required for implementing large-scale trapped-ion QIP have been demonstrated, with one key exception: a massively parallel ion-photon interconnect. Arrays of microfabricated phase Fresnel lenses (PFL) are a promising interconnect solution that is readily integrated with ion trap arrays for large-scale QIP. Here we show the first imaging of trapped ions with a microfabricated in-vacuum PFL, demonstrating performance suitable for scalable QIP. A single ion fluorescence collection efficiency of 4.2±1.5% was observed. The depth of focus for the imaging system was 19.4±2.4μm and the field of view was 140±20μm. Our approach also provides an integrated solution for high-efficiency optical coupling in neutral atom and solid-state QIP architectures