@article{Stutter:2017:10.1080/09500340.2017.1376719,
author = {Stutter, G and Hrmo, P and Jarlaud, V and Joshi, MK and Goodwin, JF and Thompson, RC},
doi = {10.1080/09500340.2017.1376719},
journal = {Journal of Modern Optics},
pages = {64--74},
title = {Sideband cooling of small ion Coulomb crystals in a Penning trap},
url = {http://dx.doi.org/10.1080/09500340.2017.1376719},
volume = {65},
year = {2017}
}

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TY  - JOUR
AB  - 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.
AU  - Stutter,G
AU  - Hrmo,P
AU  - Jarlaud,V
AU  - Joshi,MK
AU  - Goodwin,JF
AU  - Thompson,RC
DO  - 10.1080/09500340.2017.1376719
EP  - 74
PY  - 2017///
SN  - 0950-0340
SP  - 64
TI  - Sideband cooling of small ion Coulomb crystals in a Penning trap
T2  - Journal of Modern Optics
UR  - http://dx.doi.org/10.1080/09500340.2017.1376719
UR  - http://hdl.handle.net/10044/1/53462
VL  - 65
ER  - 

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