RESUMO
All laser-driven entangling operations for trapped-ion qubits have hitherto been performed without control of the optical phase of the light field, which precludes independent tuning of the carrier and motional coupling. By placing ^{88}Sr^{+} ions in a λ=674 nm standing wave, whose relative position is controlled to ≈λ/100, we suppress the carrier coupling by a factor of 18, while coherently enhancing the spin-motion coupling. We experimentally demonstrate that the off-resonant carrier coupling imposes a speed limit for conventional traveling-wave Mølmer-Sørensen gates; we use the standing wave to surpass this limit and achieve a gate duration of 15 µs, restricted by the available laser power.
RESUMO
The existing liquid low level waste (LLLW) ystem of the Oak Ridge National Laboratory is used to collect, newtralize, concentrate, and store the radiactive and toxic waste from various sources and the Laboratory. The waste solutions are discharged from source facilities to individual collection tanks, transferred by underground piping to an evaporator facility for concentration, and pumped through the underground piping storage in underground tanks. The existing LLLW system was installed in the 1950s with several system additions up to the present. The worst-case accident postulated is an earthquake of sufficient magnitude to rupture tha tanks and/or piping so as to damage the containment integrity to thesurrounding soil and environment, The objective of an analysis of the system to provide a level of confidence in the seismic resistance of the LLWsystem to withstand the postulated earthquake (AU)