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Composite pulses for interferometry in a thermal cold atom cloud

Composite pulses for interferometry in a thermal cold atom cloud
Composite pulses for interferometry in a thermal cold atom cloud
Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wave function 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 a ?80?K 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.
1050-2947
1-10
Dunning, Alexander
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Gregory, Rachel
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Bateman, James
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Cooper, Nathan
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Himsworth, Matt
24e9b896-b4d3-40f7-8047-82a38efa4898
Freegarde, Tim
01a5f53b-d406-44fb-a166-d8da9128ea7d
Jones, Jonathan A.
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Dunning, Alexander
0da350ff-2b5e-4e68-a526-2a1f812c4395
Gregory, Rachel
8a544eeb-87d2-496b-8d26-6ddfe4c10ead
Bateman, James
05b8f150-3d00-49f6-bf35-3d535b773b53
Cooper, Nathan
0ce01d5f-1845-448e-8f27-a07df4681eb7
Himsworth, Matt
24e9b896-b4d3-40f7-8047-82a38efa4898
Freegarde, Tim
01a5f53b-d406-44fb-a166-d8da9128ea7d
Jones, Jonathan A.
b543fbbd-d8c9-4c68-a360-2b0ac1f7cfb1

Dunning, Alexander, Gregory, Rachel, Bateman, James, Cooper, Nathan, Himsworth, Matt, Freegarde, Tim and Jones, Jonathan A. (2014) Composite pulses for interferometry in a thermal cold atom cloud. Physical Review A, 90 (33608), 1-10. (doi:10.1103/PhysRevA.90.033608).

Record type: Article

Abstract

Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wave function 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 a ?80?K 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.

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More information

e-pub ahead of print date: 8 September 2014
Published date: September 2014
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 393596
URI: http://eprints.soton.ac.uk/id/eprint/393596
ISSN: 1050-2947
PURE UUID: b7257ef4-f4d2-4a92-a15f-8c249050df5e
ORCID for Tim Freegarde: ORCID iD orcid.org/0000-0002-0680-1330

Catalogue record

Date deposited: 29 Apr 2016 08:47
Last modified: 18 Feb 2021 17:01

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Contributors

Author: Alexander Dunning
Author: Rachel Gregory
Author: James Bateman
Author: Nathan Cooper
Author: Matt Himsworth
Author: Tim Freegarde ORCID iD
Author: Jonathan A. Jones

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