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Is there a link between conventional Quantum Mechanics and QFT?

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Possible Duplicate:
Is there a theorem that says that QFT reduces to QM in a suitable limit? A theorem similar to Ehrenfest's theorem?

Just as Quantum Mechanics is related to Classical Mechanics via Ehrenfest's Theorem, Is there a theoretical link between say, the free scalar field theory and Schroedinger's Equation?

What about QFT theories with spin?

This post has been migrated from (A51.SE)

asked Jan 30, 2012 in Theoretical Physics by Xzoechord (10 points) [ no revision ]

A similar question was asked here http://theoreticalphysics.stackexchange.com/q/237/208

This post has been migrated from (A51.SE)

commented Jan 30, 2012 by Marco (260 points) [ no revision ]

Comparing Quantum Field Theory with Quantum Mechanics is a little like comparing an english poem with the english language.

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commented Jan 31, 2012 by Nick Kidman (0 points) [ no revision ]

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