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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.1,2, Hrmo, P.1, Jarlaud, V.1, Joshi, M. K.1, Goodwin, J. F.1,2, Thompson, R. C.1 r.thompson@imperial.ac.uk
Source: Journal of Modern Optics. Mar2018, Vol. 65 Issue 5/6, p549-559. 11p.
Subjects: Laser cooling, Ground state (Quantum mechanics), Penning traps, Center of mass, Magnetic fields, Quadrupoles
Abstract: We have recently demonstrated the laser cooling of a single ion to the motional ground state in a Penning trap using the resolved-sideband cooling technique on the electric quadrupole transition S D. Here we report on the extension of this technique to small ion Coulomb crystals made of two or three 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 for the centre of mass (COM) mode and for the breathing mode of the two-ion string with corresponding heating rates of 11(2)  and at a trap frequency of 162 kHz. The occupation of the ground state of the axial modes () is above 75% for the two-ion planar crystal and the associated heating rates 0.8(5)  at a trap frequency of 355 kHz. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 128375574
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Sideband cooling of small ion Coulomb crystals in a Penning trap.
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  Data: <searchLink fieldCode="AR" term="%22Stutter%2C+G%2E%22">Stutter, G.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Hrmo%2C+P%2E%22">Hrmo, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jarlaud%2C+V%2E%22">Jarlaud, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Joshi%2C+M%2E+K%2E%22">Joshi, M. K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Goodwin%2C+J%2E+F%2E%22">Goodwin, J. F.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Thompson%2C+R%2E+C%2E%22">Thompson, R. C.</searchLink><relatesTo>1</relatesTo><i> r.thompson@imperial.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Modern+Optics%22">Journal of Modern Optics</searchLink>. Mar2018, Vol. 65 Issue 5/6, p549-559. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Laser+cooling%22">Laser cooling</searchLink><br /><searchLink fieldCode="DE" term="%22Ground+state+%28Quantum+mechanics%29%22">Ground state (Quantum mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Penning+traps%22">Penning traps</searchLink><br /><searchLink fieldCode="DE" term="%22Center+of+mass%22">Center of mass</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Quadrupoles%22">Quadrupoles</searchLink>
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  Data: We have recently demonstrated the laser cooling of a single <inline-graphic></inline-graphic> ion to the motional ground state in a Penning trap using the resolved-sideband cooling technique on the electric quadrupole transition S<inline-graphic></inline-graphic> D<inline-graphic></inline-graphic>. Here we report on the extension of this technique to small ion Coulomb crystals made of two or three <inline-graphic></inline-graphic> 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 <inline-graphic></inline-graphic> for the centre of mass (COM) mode and <inline-graphic></inline-graphic> for the breathing mode of the two-ion string with corresponding heating rates of 11(2) <inline-graphic></inline-graphic> and <inline-graphic></inline-graphic> at a trap frequency of 162 kHz. The occupation of the ground state of the axial modes (<inline-graphic></inline-graphic>) is above 75% for the two-ion planar crystal and the associated heating rates 0.8(5) <inline-graphic></inline-graphic> at a trap frequency of 355 kHz. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1080/09500340.2017.1376719
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 549
    Subjects:
      – SubjectFull: Laser cooling
        Type: general
      – SubjectFull: Ground state (Quantum mechanics)
        Type: general
      – SubjectFull: Penning traps
        Type: general
      – SubjectFull: Center of mass
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Quadrupoles
        Type: general
    Titles:
      – TitleFull: Sideband cooling of small ion Coulomb crystals in a Penning trap.
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            NameFull: Stutter, G.
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            NameFull: Hrmo, P.
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            NameFull: Joshi, M. K.
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              Text: Mar2018
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