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Sideband cooling of small ion Coulomb crystals in a Penning trap

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Title: Sideband cooling of small ion Coulomb crystals in a Penning trap
Authors: Stutter, G
Hrmo, P
Jarlaud, V
Joshi, MK
Goodwin, JF
Thompson, RC
Item Type: Journal Article
Abstract: We have recently demonstrated the laser cooling of a single 40 Ca + ion to the motional ground state in a Penning trap using the resolved-sideband cooling technique on the electric quadrupole transition S 1/2 ↔ D 5/2 . Here we report on the extension of this technique to small ion Coulomb crystals made of two or three 40 Ca + ions. Efficient cooling of the axial motion is achieved outside the Lamb-Dicke regime on a two-ion string along the magnetic field axis as well as on two- and three-ion planar crystals. Complex sideband cooling sequences are required in order to cool both axial degrees of freedom simultaneously. We measure a mean excitation after cooling of n COM for the centre of mass (COM) mode and n B for the breathing mode of the two-ion string with corresponding heating rates of 11(2)s -1 and 1(1)s -1 at a trap frequency of 162 kHz. The occupation of the ground state of the axial modes (n tilt = n COM = 0) is above 75% for the two-ion planar crystal and the associated heating rates 0.8(5)s -1 at a trap frequency of 355 kHz.
Issue Date: 24-Oct-2017
Date of Acceptance: 25-Aug-2017
URI: http://hdl.handle.net/10044/1/53462
DOI: https://dx.doi.org/10.1080/09500340.2017.1376719
ISSN: 0950-0340
Publisher: Taylor & Francis
Start Page: 64
End Page: 74
Journal / Book Title: Journal of Modern Optics
Volume: 65
Issue: 1
Copyright Statement: This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Modern Optics on 24 Oct 2017, available online at: http://www.tandfonline.com/10.1080/09500340.2017.1376719
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: GR/R14415/01
EP/D068509/1
249958
N/A
Keywords: quant-ph
0205 Optical Physics
0206 Quantum Physics
1007 Nanotechnology
Optics
Publication Status: Published
Appears in Collections:Quantum Optics and Laser Science
Physics
Faculty of Natural Sciences



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