My good friend, John Taylor Williams, tweeted this Futurity story about a recent breakthrough in quantum computing. One of the key challenges to achieving practical computations is to scale quantum circuits and registers to sizes where this is possible.
Jason Petta at Princeton and his colleagues have demonstrated a technique for corralling single electrons so that they can be manipulated individually. Previous techniques apparently suffered from a coarse scale, using high energy inputs that not only affecting larger numbers of particles but were terribly slow. According to the article, this technique may also help better isolate from interference the qubits in their delicate coherent state.
Lots more excellent detail at the Futurity article.
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