噓 tengharold:stop posting crap. 12/14 08:59
※ 引述《uniserv1002 (uniserv)》之銘言：
: a procedure for quantizing a classical theory while attempting to preserve
: the formal structure of the classical theory
: historically, this was Werner Heisenberg's route to obtaining quantum
: mechanics
: the word 'canonical' arises from the Hamiltonian approach to classical
: mechanics, in which a system's dynamics is generated via canonical Poisson
: brackets, a structure that is preserved to the extent possible.
second quantization
quantum mechanics was successful at describing non-relativistic single-
particle systems, but a new framework is needed to describe systems in
which particles can be created or destroyed, for example, the electromagnetic
field, considered as a collection of photons
it was eventually realized that special relativity was inconsistent with
single-particle quantum mechanics, so that all particles are now described
relativistically by quantum fields. when the canonical quantization procedure
is applied to quantum field theory, the classical field variable becomes a
quantum operator. the amplitude of the field becomes quantized, and the
quanta are identified with individual particles
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