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Classical dynamics as constrained quantum dynamics

Stephen D Bartlett1,2 and David J Rowe2

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We show that the classical mechanics of an algebraic model are implied by its quantizations. An algebraic model is defined, and the corresponding classical and quantum realizations are given in terms of a spectrum generating algebra. Classical equations of motion are then obtained by constraining the quantal dynamics of an algebraic model to an appropriate coherent state manifold. For the cases where the coherent state manifold is not symplectic, it is shown that there exist natural projections onto classical phase spaces. These results are illustrated with the extended example of an asymmetric top.


PACS

03.65.Fd Algebraic methods

02.20.Sv Lie algebras of Lie groups

03.65.Sq Semiclassical theories and applications

02.40.Sf Manifolds and cell complexes

MSC

22E60 Lie algebras of Lie groups (For the algebraic theory of Lie algebras, see 17Bxx)

81R30 Coherent states (See also 22E45); squeezed states (See also 81V80)

Subjects

Mathematical physics

Quantum information and quantum mechanics

Dates

Issue 6 (14 February 2003)

Received 21 November 2002

Published 29 January 2003



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