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Optimal pulses for enhanced interferometer sensitivity and contrast

Optimal pulses for enhanced interferometer sensitivity and contrast
Optimal pulses for enhanced interferometer sensitivity and contrast
The mirrors and beamsplitters of atom interferometers often suffer from inhomogeneities in coupling strength and effective detuning because different atoms see different laser intensities, Zeeman and Doppler shifts and are in different Zeeman sub-states. This limits the fringe visibility for a simple interferometer, which falls off rapidly if extra mirrors are added, for example to increase the interferometer area. In practice, one usually therefore filters the atomic velocities/sub-states, thus losing signal, and/or restricting operation to small-area interferometers with low sensitivity.

The problem is familiar in the field of NMR, where, instead of using simple pi or pi/2 pulses, the phase and potentially amplitude are modulated during the pulse so as to make the result robust to the inhomogeneities encountered. Despite the similarities with NMR systems, the numbers, correlations and performance measures for atom interferometry are different. We have used optimal control theory to obtain robust high fidelity mirror pulses for atom interferometry. Importantly, while the designs are found by computational simulation, we can validate them experimentally, with remarkably good agreement.

We have addressed the optimization of individual mirror pulses, but the eventual aim is to optimize the interferometer as a whole: errors introduced in one pulse can be compensated at a later stage, for example. Our pulses yield high contrast without the need to filter the atomic sample and maintain this even in the case of extended pulse sequences, thus making it possible to achieve significantly larger interferometer areas than with simple pi pulses.
Saywell, Jack, Cameron
da7a642a-ed67-4bd0-8959-e4c2874a8e67
Carey, Max, Sebastian
9d637a1b-e432-4401-968a-5e6da40435ff
Elcock, David, Emanuel
03ce0d6c-6a49-4a4d-8caf-71b32b254ac4
Belal, Mohammad
33550de9-0df1-4c90-bae6-3eb65c62778a
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Freegarde, Timothy
01a5f53b-d406-44fb-a166-d8da9128ea7d
Saywell, Jack, Cameron
da7a642a-ed67-4bd0-8959-e4c2874a8e67
Carey, Max, Sebastian
9d637a1b-e432-4401-968a-5e6da40435ff
Elcock, David, Emanuel
03ce0d6c-6a49-4a4d-8caf-71b32b254ac4
Belal, Mohammad
33550de9-0df1-4c90-bae6-3eb65c62778a
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Freegarde, Timothy
01a5f53b-d406-44fb-a166-d8da9128ea7d

Saywell, Jack, Cameron, Carey, Max, Sebastian, Elcock, David, Emanuel, Belal, Mohammad, Kuprov, Ilya and Freegarde, Timothy (2018) Optimal pulses for enhanced interferometer sensitivity and contrast. Frontiers in Matter Wave Optics, Crete, Greece. 17 - 21 Sep 2018.

Record type: Conference or Workshop Item (Poster)

Abstract

The mirrors and beamsplitters of atom interferometers often suffer from inhomogeneities in coupling strength and effective detuning because different atoms see different laser intensities, Zeeman and Doppler shifts and are in different Zeeman sub-states. This limits the fringe visibility for a simple interferometer, which falls off rapidly if extra mirrors are added, for example to increase the interferometer area. In practice, one usually therefore filters the atomic velocities/sub-states, thus losing signal, and/or restricting operation to small-area interferometers with low sensitivity.

The problem is familiar in the field of NMR, where, instead of using simple pi or pi/2 pulses, the phase and potentially amplitude are modulated during the pulse so as to make the result robust to the inhomogeneities encountered. Despite the similarities with NMR systems, the numbers, correlations and performance measures for atom interferometry are different. We have used optimal control theory to obtain robust high fidelity mirror pulses for atom interferometry. Importantly, while the designs are found by computational simulation, we can validate them experimentally, with remarkably good agreement.

We have addressed the optimization of individual mirror pulses, but the eventual aim is to optimize the interferometer as a whole: errors introduced in one pulse can be compensated at a later stage, for example. Our pulses yield high contrast without the need to filter the atomic sample and maintain this even in the case of extended pulse sequences, thus making it possible to achieve significantly larger interferometer areas than with simple pi pulses.

Full text not available from this repository.

More information

Published date: 20 September 2018
Venue - Dates: Frontiers in Matter Wave Optics, Crete, Greece, 2018-09-17 - 2018-09-21

Identifiers

Local EPrints ID: 425404
URI: https://eprints.soton.ac.uk/id/eprint/425404
PURE UUID: 03ddad9f-b958-4958-aa34-a283019f7bee
ORCID for Max, Sebastian Carey: ORCID iD orcid.org/0000-0001-5283-5972
ORCID for Mohammad Belal: ORCID iD orcid.org/0000-0001-5175-3158
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: 18 Oct 2018 16:30
Last modified: 14 Mar 2019 01:44

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