Descriptions of quadratic plus linear operators which preserve pure states of the quantum system
As we knew, a mathematical formalism of a quantum mechanics says that any quantum system is identified with some finite- or infinite-dimensional Hilbert space; pure states correspond to vectors of norm 1; observables are self-adjoint operators on the space of states. Thus the set of all pure stat...
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2013
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| Online Access: | http://irep.iium.edu.my/33661/ http://irep.iium.edu.my/33661/1/Paper_for_IREP.pdf |
| Summary: | As we knew, a mathematical formalism of a quantum mechanics says that any quantum system is
identified with some finite- or infinite-dimensional Hilbert space; pure states correspond to vectors
of norm 1; observables are self-adjoint operators on the space of states. Thus the set of all pure
states corresponds to the unit sphere in the Hilbert space [1-2]. It is of interest to describe all linear
or nonlinear operators which preserve the pure states of the system. In the linear case, it is nothing
more than isometries of Hilbert spaces [1]. In the nonlinear case, this problem was open. In this
paper we shall describe all quadratic plus linear operators which preserve pure states of the
quantum system.! |
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