5 research outputs found
Reducing Rydberg state dc polarizability by microwave dressing
We demonstrate reduction of the dc polarizability of Cesium atom Rydberg
states in a 77 K environment utilizing microwave field dressing. In particular
we reduce the polarizability of states which have resonances at
5.35 GHz to , suitable for interfacing Rydberg atoms to
superconducting resonators in a cryogenic environment. We measure the
polarizability of the Rydberg states using Magneto-Optical-Trap (MOT) loss
spectroscopy. Using an off-resonant radio-frequency (RF) dressing field
coupling and we demonstrate a reduction in dc
polarizability of the states over 80. Experimental findings
are in good agreement with a numerical model of the atom-dressing field system
developed using the Shirley-Floquet formalism. We also demonstrate that the dc
polarizability reduction is highly anisotropic, with near total nulling
possible when the dc and dressing fields are aligned, but only a factor of two
reduction in polarizability when the fields are orthogonal. These results may
aid in stabilizing Rydberg resonances against varying dc fields present near
surfaces, enabling advancement in the development of hybrid Rydberg atom -
superconducting resonator quantum gates
Mid-circuit measurements on a single species neutral alkali atom quantum processor
We demonstrate mid-circuit measurements in a neutral atom array by shelving
data qubits in protected hyperfine-Zeeman sub-states while non-destructively
measuring an ancilla qubit. Measurement fidelity was enhanced using microwave
repumping of the ancilla during the measurement. The coherence of the shelved
data qubits was extended during the ancilla readout with dynamical decoupling
pulses, after which the data qubits are returned to mf = 0 computational basis
states. We demonstrate that the quantum state of the data qubits is well
preserved up to a constant phase shift with a state preparation and measurement
(SPAM) corrected process fidelity of F = 97.0(5)%. The measurement fidelity on
the ancilla qubit after correction for state preparation errors is F = 94.9(8)%
and F = 95.3(1.1)% for |0> and |1> qubit states, respectively. We discuss
extending this technique to repetitive quantum error correction using
quadrupole recooling and microwave-based quantum state resetting.Comment: v3: additional appendices with fidelity analysis adde
Precipitation of particles using combined high turbulence extraction assisted by ultrasound and supercritical antisolvent fractionation
High Turbulence Extraction Assisted by Ultrasound combined with Supercritical Antisolvent Fractionation (SAF) was done to intensify the recovery of bixin and phenolic compounds from semi-defatted annatto seeds. Annatto seeds are extensively used due to its colorant properties and bioactive potential in human health. Modifications were performed in the SAF experimental apparatus in order to prevent losses of product. Results show that supercritical fractionation resulted in particle yields between 72.2–80.5%, 20–50% phenolics, and 66% bixin.3549CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP302423/2015-088882.305824/2013-012015/13299-