Al\textsuperscript{+} Spectroscopy via Sympathetic Cooling and Quantum Information Transfer using Be\textsuperscript{+}

A single \textsuperscript{9}Be\textsuperscript{+} ion and a single \textsuperscript{27}Al\textsuperscript{+} ion are simultaneously trapped in order to perform optical spectroscopy on the Al\textsuperscript{+} ion. The ion pair is cooled near its motional ground state by laser-cooling the Be\textsuperscript{+} ion. We then apply spectroscopy pulses to interrogate the cold Al\textsuperscript{+} ion. The effect of these pulses is measured by transferring the Al\textsuperscript{+} internal quantum state to the Be\textsuperscript{+} hyperfine state with motional sideband laser pulses, where it is detected with high efficiency. This two-ion technique allows laser spectroscopy on cold ions that do not possess suitable transitions for laser cooling or state detection. We present results that demonstrate the effectiveness of this intra-species quantum information transfer. As a first application of the technique we have measured the \textsuperscript{27}Al\textsuperscript{+} \textsuperscript{1}S$_0 $ $\rightarrow$ \textsuperscript{3}P$_{1}(F=7/2)$ transition frequency to be $1,122,842,857,335(1)$kHz, which represents an improvement in accuracy over previous measurements by six orders of magnitude. * This work was supported by ONR and NIST