Population dynamics in sideband cooling of trapped ions outside the Lamb-Dicke regime

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Title: Population dynamics in sideband cooling of trapped ions outside the Lamb-Dicke regime
Authors: Joshi, MK
Hrmo, P
Jarlaud, V
Oehl, F
Thompson, RC
Item Type: Journal Article
Abstract: We present the results of simulations of optical sideband cooling of atomic ions in a trap with a shallow potential well. In such traps, an ion cannot be Doppler cooled near to the Lamb-Dicke regime [ η 2 ( 2 ⟨ n ⟩ + 1 ) ≪ 1 ] . Outside the Lamb-Dicke regime, the sideband cooling dynamics are altered by the existence of various Fock states with weak coupling where the cooling becomes very slow. A 40 Ca + ion trapped in our Penning trap realizes such a situation; hence single stage cooling is inefficient to prepare the ion in the motional ground state. For these systems, it is necessary to study the cooling dynamics in detail and we show that it is possible to implement an optimized cooling sequence to achieve efficient ground-state cooling. We also present the simulated cooling dynamics of two ions trapped in a Penning trap, where the presence of an additional motional mode requires a complicated cooling sequence in order to cool both axial modes to the ground state simultaneously. Additionally, we demonstrate the dissipative preparation of Fock states outside the Lamb-Dicke regime by sideband heating a single ion in a Penning trap.
Issue Date: 18-Jan-2019
Date of Acceptance: 1-Jan-2019
URI: http://hdl.handle.net/10044/1/72570
DOI: https://doi.org/10.1103/PhysRevA.99.013423
ISSN: 1050-2947
Publisher: American Physical Society
Journal / Book Title: Physical Review A
Volume: 99
Issue: 1
Copyright Statement: ©2019 American Physical Society
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: 249958
N/A
Keywords: Science & Technology
Physical Sciences
Optics
Physics, Atomic, Molecular & Chemical
Physics
REALIZATION
SIMULATION
HUNDREDS
Science & Technology
Physical Sciences
Optics
Physics, Atomic, Molecular & Chemical
Physics
REALIZATION
SIMULATION
HUNDREDS
physics.atom-ph
physics.atom-ph
quant-ph
Publication Status: Published
Article Number: 013423
Appears in Collections:Quantum Optics and Laser Science
Physics
Faculty of Natural Sciences



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