[ExI] Quantum Computers

[John Clark]

Perhaps the biggest problem in making a quantum computer is overcoming
quantum decoherence. In yesterday's issue of the journal  Science Kamyar
Saeedi and his team reported that they placed phosphorous atoms in a
silicon matrix in a state of quantum coherence for over 3 hours at liquid
helium temperatures. And even at room temperature they remained in quantum
coherence for 39 minutes, at room temperature the previous record was 2
seconds.  They think they might be able to do even better, and possibly
much better, if they use selenium instead of phosphorous next time.

  John K Clark
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