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Applied Physics B

, Volume 121, Issue 2, pp 147–153 | Cite as

Sideband cooling of a \(\hbox {Ca}^+\)\(\hbox {In}^+\) ion chain toward the quantum logic spectroscopy of \(\hbox {In}^+\)

  • Utako TanakaEmail author
  • Tomohiro Kitanaka
  • Kazuhiro Hayasaka
  • Shinji Urabe
Article

Abstract

Indium ions (\({}^{115}\hbox {In}^+\)) are a promising candidate for an optical clock with a frequency inaccuracy below \(10^{-17}\). Quantum logic spectroscopy (QLS) plays a fundamental role in realizing such a clock by supplying a high-fidelity fast quantum state detection method. Initializing a phonon mode of an ion chain consisting of \(\hbox {In}^+\) and an ancillary ion to the ground state is a fundamental step toward the implementation of QLS. We report experimental results of the sideband cooling and heating rate measurements of a \({}^{40}\hbox {Ca}^+\)\({}^{115}\hbox {In}^+\) chain using optical transitions in \(\hbox {Ca}^+\). The sideband cooling of the out-of-phase mode of the axial motion down to an estimated phonon number of 0.096 is demonstrated.

Keywords

Radial Mode Vibrational Quantum Number Optical Clock Homogeneous Electric Field Sympathetic Cool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Utako Tanaka
    • 1
    Email author
  • Tomohiro Kitanaka
    • 1
  • Kazuhiro Hayasaka
    • 2
  • Shinji Urabe
    • 1
  1. 1.Graduate School of Engineering ScienceOsaka UniversityToyonakaJapan
  2. 2.National Institute of Information and Communications TechnologyKobeJapan

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