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Optimal control of mirror pulses for cold-atom interferometry

Optimal control of mirror pulses for cold-atom interferometry
Optimal control of mirror pulses for cold-atom interferometry
Atom matterwave interferometry requires mirror and beamsplitter pulses that are robust to inhomogeneities in field intensity, magnetic environment, atom velocity and Zeeman sub-state. We present theoretical results which show that pulse shapes determined using quantum control methods can significantly improve interferometer performance by allowing broader atom distributions, larger interferometer areas and higher contrast. We have applied gradient ascent pulse engineering (GRAPE) to optimise the design of phase-modulated mirror pulses for a Mach-Zehnder light-pulse atom interferometer, with the aim of increasing fringe contrast when averaged over atoms with an experimentally relevant range of velocities, beam intensities, and Zeeman states. Pulses were found to be highly robust to variations in detuning and coupling strength, and offer a clear improvement in robustness over the best established composite pulses. The peak mirror fidelity in a cloud of ∼ 80 µK 85Rb atoms is predicted to be improved by a factor of 2 compared with standard rectangular π pulses.
2469-9926
1-9
Saywell, Jack Cameron
da7a642a-ed67-4bd0-8959-e4c2874a8e67
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Goodwin, David
349b642d-bc15-4a8d-b1d7-98691a39e069
Carey, Max
c2b2911d-e3a9-4537-b16e-9bbfd3b68c6c
Freegarde, Timothy
01a5f53b-d406-44fb-a166-d8da9128ea7d
Saywell, Jack Cameron
da7a642a-ed67-4bd0-8959-e4c2874a8e67
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Goodwin, David
349b642d-bc15-4a8d-b1d7-98691a39e069
Carey, Max
c2b2911d-e3a9-4537-b16e-9bbfd3b68c6c
Freegarde, Timothy
01a5f53b-d406-44fb-a166-d8da9128ea7d

Saywell, Jack Cameron, Kuprov, Ilya, Goodwin, David, Carey, Max and Freegarde, Timothy (2018) Optimal control of mirror pulses for cold-atom interferometry. Physical Review A, 98, 1-9, [023625]. (doi:10.1103/PhysRevA.98.023625).

Record type: Article

Abstract

Atom matterwave interferometry requires mirror and beamsplitter pulses that are robust to inhomogeneities in field intensity, magnetic environment, atom velocity and Zeeman sub-state. We present theoretical results which show that pulse shapes determined using quantum control methods can significantly improve interferometer performance by allowing broader atom distributions, larger interferometer areas and higher contrast. We have applied gradient ascent pulse engineering (GRAPE) to optimise the design of phase-modulated mirror pulses for a Mach-Zehnder light-pulse atom interferometer, with the aim of increasing fringe contrast when averaged over atoms with an experimentally relevant range of velocities, beam intensities, and Zeeman states. Pulses were found to be highly robust to variations in detuning and coupling strength, and offer a clear improvement in robustness over the best established composite pulses. The peak mirror fidelity in a cloud of ∼ 80 µK 85Rb atoms is predicted to be improved by a factor of 2 compared with standard rectangular π pulses.

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optimal_control_grape_saywell - Accepted Manuscript
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PhysRevA.98.023625 - Version of Record
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More information

Accepted/In Press date: 7 July 2018
e-pub ahead of print date: 22 August 2018
Published date: August 2018

Identifiers

Local EPrints ID: 422910
URI: http://eprints.soton.ac.uk/id/eprint/422910
ISSN: 2469-9926
PURE UUID: 3350ba85-19c6-48ed-96cb-4d7e69672dc0
ORCID for Ilya Kuprov: ORCID iD orcid.org/0000-0003-0430-2682
ORCID for Timothy Freegarde: ORCID iD orcid.org/0000-0002-0680-1330

Catalogue record

Date deposited: 07 Aug 2018 16:31
Last modified: 10 Jun 2020 00:32

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