Individual-ion addressing with microwave field gradients.

@article{Warring2013IndividualionAW,
  title={Individual-ion addressing with microwave field gradients.},
  author={Ulrich Warring and Christian Ospelkaus and Yves Colombe and R J{\"o}rdens and Dietrich Leibfried and David J. Wineland},
  journal={Physical review letters},
  year={2013},
  volume={110 17},
  pages={
          173002
        }
}
Individual-qubit addressing is a prerequisite for many instances of quantum information processing. We demonstrate this capability on trapped-ion qubits with microwave near fields delivered by electrode structures integrated into a microfabricated surface-electrode trap. We describe four approaches that may be used in quantum information experiments with hyperfine levels as qubits. We implement individual control on two 25Mg+ ions separated by 4.3  μm and find spin-flip crosstalk errors on the… 

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