http://www.nist.gov/public_affairs/releases/n00-02.htm
"We found that ...the influence of the
environment on the delicate superposition quickly
become a factor as you increase the distance between the
two states of the atom. This dependence on separation
tells us why it’s impossible for us to see
superpositions in
our macro-sized world," explains David J. Wineland, a
member of the NIST team.
Damien
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