Authors Referees APS Members |
January 2008, to be published in Physical Review A
Characterization of quantum angular-momentum fluctuations via principal
components
We elaborate an approach to quantum fluctuations of angular momentum based on the diagonalization of the covariance matrix in two versions: real symmetric and complex Hermitian. At difference with previous approaches this is SU(2) invariant and avoids any difficulty caused by nontrivial commutators. Meaningful uncertainty relations are derived which are nontrivial even for vanishing mean angular momentum. We apply this approach to some relevant states. © 2008 The American Physical Society.
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