Optimal Evaluation of Generalized Euler Angles with Applications to Classical and Quantum Control

Details Optimal Evaluation of Generalized Euler Angles with Applications to Classical and Quantum Control Optimal Evaluation of Generalized Euler Angles with Applications to Classical and Quantum Control

2001-10-19

arxiv.org/abs/quant-ph/0110120v1

Physics

Quantum Physics

Scientific paper

Given two linearly independent matrices in $so(3)$, $Z_1$ and $Z_2$, every rotation matrix $X_f \in SO(3)$ can be written as the product of alternate elements from the one dimensional subgroups corresponding to $Z_1$ and $Z_2$, namely $X_f=e^{Z_1 t_1}e^{Z_2 t_2}e^{Z_1t_3} \cdot \cdot \cdot e^{Z_1t_s}$. The parameters $t_i$, $i=1,...,s$ are called {\it generalized Euler angles}. In this paper, we evaluate the minimum number of factors required for the factorization of $X_f \in SO(3)$, as a function of $X_f$, and provide an algorithm to determine the generalized Euler angles explicitly. The results can be applied to the bang bang control with minimum number of switches of some classical control systems and of two level quantum systems.

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