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Optical stimulated-Raman sideband spectroscopy of a single <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Be</mml:mi><mml:none /><mml:mo>+</mml:mo><mml:mprescripts /><mml:none /><mml:mn>9</mml:mn></mml:mmultiscripts></mml:math> ion in a Penning trap
A sideband spectroscopy of a single beryllium ion in a Penning trap is demonstrated, finding a temperature of (3.1 $\ifmmode\pm\else\textpm\fi{}$ 0.4) mK. This is a key step for ground-state cooling, so that motional degrees of freedom in Penning traps can be manipulated at the single-quantum level for quantum logic applications …