Deterministic entanglement of two trapped ions
  We have prepared the internal states of two trapped ions in both the Bell-like singlet and triplet entangled states. In contrast to all other experiments with entangled states of either massive particles or photons, we do this in a deterministic fashion, producing entangled states on demand without selection. The deterministic production of entangled states is a crucial prerequisite for large-scale quantum computation. 
Q.A. Turchette, C.S. Wood, B.E. King, C.J. Myatt, D. Leibfried, W.M.   Itano, C. Monroe, D.J. Wineland (Time and Frequency D...