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Composite pulses for interferometry in a thermal cold atom cloud / Alexander Dunning; Rachel Gregory; James Bateman; Nathan Cooper; Matthew Himsworth; Jonathan A. Jones; Tim Freegarde

Physical Review A, Volume: 90, Issue: 3

Swansea University Author: James, Bateman

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DOI (Published version): 10.1103/PhysRevA.90.033608

Abstract

Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wavefunction is split, transformed and recombined, but suffer from experimental inhomogeneities and uncertainties in the speeds and paths of these operations. Several error-correction t...

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Published in: Physical Review A
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa28706
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Abstract: Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wavefunction is split, transformed and recombined, but suffer from experimental inhomogeneities and uncertainties in the speeds and paths of these operations. Several error-correction techniques have been proposed to isolate the variable of interest. Here we apply composite pulse methods to velocity-sensitive Raman state manipulation in a freely-expanding thermal atom cloud. We compare several established pulse sequences, and follow the state evolution within them. The agreement between measurements and simple predictions shows the underlying coherence of the atom ensemble, and the inversion infidelity in an 80 micro-Kelvin atom cloud is halved. Composite pulse techniques, especially if tailored for atom interferometric applications, should allow greater interferometer areas, larger atomic samples and longer interaction times, and hence improve the sensitivity of quantum technologies from inertial sensing and clocks to quantum information processors and tests of fundamental physics.
College: College of Science
Issue: 3