Realization of a programmable two-qubit quantum processor

@article{Hanneke2009RealizationOA,
  title={Realization of a programmable two-qubit quantum processor},
  author={David Hanneke and J. P. Home and John D. Jost and Jason M. Amini and Dietrich Leibfried and David J. Wineland},
  journal={Nature Physics},
  year={2009},
  volume={6},
  pages={13-16}
}
A simple programmable quantum processor has been created using trapped atomic ions. The system can be programmed with 15 classical inputs to produce any unitary operation on two qubits. This trapped-ion approach is amenable to scaling up for creating more complex circuits. 

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