# Versatile control of $^9$Be$^+$ ions using a spectrally tailored UV frequency comb

## TL;DR

This paper presents a method for controlling $^9$Be$^+$ ions using a spectrally tailored UV frequency comb, enabling efficient quantum state manipulation for quantum computing applications.

## Contribution

It introduces a novel technique for generating a spectrally tailored narrow-bandwidth optical frequency comb near 313 nm and demonstrates its use in quantum control of $^9$Be$^+$ ions.

## Key findings

- Successful internal state control of $^9$Be$^+$ ions.
- Efficient internal-motional state coupling demonstrated.
- Spectrally optimized comb enables quantum logic operations.

## Abstract

We demonstrate quantum control of $^9$Be$^+$ ions directly implemented by an optical frequency comb. Based on numerical simulations of the relevant processes in $^9$Be$^+$ for different magnetic field regimes, we demonstrate a wide applicability when controlling the comb's spectral properties. We introduce a novel technique for the selective and efficient generation of a spectrally tailored narrow-bandwidth optical frequency comb near 313 nm. We experimentally demonstrate internal state control and internal-motional state coupling of $^9$Be$^+$ ions implemented by stimulated-Raman manipulation using a spectrally optimized optical frequency comb. Our pulsed laser approach is a key enabling step for the implementation of quantum logic and quantum information experiments in Penning traps.