Principle of Entanglement

from the June issue of Nature



BTW, don't I recall something like this from my time in the primordial ooze? Let's dance or you just can't join my revolution.


Quantum Teleportation with Atoms

Quantum teleportation, based on the principle of entanglement in which two particles become correlated and share unique properties, has been demonstrated several times using pairs of entangled photons, but in a probabilistic way. This involves an element of hindsight: photons, once paired, are detected and deemed to have teleported. In this issue two groups report 'deterministic' teleportation, involving atoms (trapped 40Ca+ ions in one case, and 9Be+ in the other), such that the outcome is predictable. The quantum identity of one atom (not the atom itself) is destroyed by quantum measurement, and that identity is reconstructed on the paired atom. This achievement is an important step towards quantum computing and telecommunications. On the cover, the 40Ca+ experiment visualized.