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Macroscopic quantum state
A
macroscopic
quantum state
is a
state of matter
in which macroscopic properties, such as
mechanical motion
,
thermal conductivity
,
electrical conductivity
and
viscosity
, can be described only by
quantum mechanics
rather than
merely
classical mechanics
. This occurs primarily at
low
temperatures where there is little
thermal motion
present to
mask
the
quantum
nature
of a
substance
.
Macroscopic quantum phenomena
can
emerge
from
coherent states
of
superfluids
and
superconductors
.
Quantum states
of
motion
have been directly
observed
in a macroscopic
mechanical
resonator
.