"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:406DA42A.7018243A@mchsi.com...

Ref: http://physicsweb.org/article/news/8/4/1

A new experiment in the US has come close to detecting
quantum effects in a macroscopic object. Keith Schwab
and colleagues from the National Security Agency (NSA)
working at the University of Maryland have measured the
vibrations of a tiny nanoelectromechanical arm to probe
the limits at which quantum behaviour breaks down and
classical physics takes over. Although the experiment
was not quite sensitive enough to test the uncertainty
principle, it has come closer to doing so than previous
attempts (M D LaHaye et al. 2004 Science 304 74).

See: http://physicsweb.org/article/news/8/4/1

Poor choice of words:
QM doesn't "break down" in the classical limit. The effect of
Planck's constant becomes insignificant compared to that of the
Hamiltonian which contains all of classical physics. [Old Man]