It is unanimously accepted that the quantum and the classical
descriptions of the physical reality are very different, although
any quantum process is "mysteriously" transformed through
measurement into an observable classical event. Beyond the
conceptual differences, quantum and classical physics have a lot in
common. And, more important, there are classical and quantum
phenomena that are similar although they occur in completely
different contexts. For example, the Schrodinger equation has the
same mathematical form as the Helmholtz equation, there is an
uncertainty relation in optics very similar to that in quantum
mechanics, and so on; the list of examples is very long.
Quantum-classical analogies have been used in recent years to study
many quantum laws or phenomena at the macroscopic scale, to design
and simulate mesoscopic devices at the macroscopic scale, to
implement quantum computer algorithms with classical means, etc. On
the other hand, the new forms of light - localized light, frozen
light - seem to have more in common with solid state physics than
with classical optics. So these analogies are a valuable tool in
the quest to understand quantum phenomena and in the search for new
(quantum or classical) applications, especially in the area of
quantum devices and computing."
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