Controllability, Observability and Parameter Identification of two coupled spin 1's

Details Controllability, Observability and Parameter Identification of two coupled spin 1's Controllability, Observability and Parameter Identification of two coupled spin 1's

2003-07-17

arxiv.org/abs/quant-ph/0307129v1

Physics

Quantum Physics

Scientific paper

In this paper, we study the control theoretic properties of a couple of interacting spin 1's driven by an electro-magnetic field. In particular, we assume that it is possible to observe the expectation value of the total magnetization and we study controllability, observability and parameter identification of these systems. We give conditions for controllability and observability and characterize the classes of equivalent models which have the same input-output behavior. The analysis is motivated by the recent interest in three level systems in quantum information theory and quantum cryptography as well as by the problem of modeling molecular magnets as spin networks.

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