Deterministic Entanglement of Two Trapped Ions
Q. A. Turchette, C. S. Wood, B. E. King, Christopher J. Myatt, Dietrich G. Leibfried, Wayne M. Itano, Christopher R. Monroe, David J. Wineland · Physical Review Letters · 1998
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.