%0 Journal Article %T The Pegg-Barnett Formalism and Covariant Phase Observables %A Pekka Lahti %A Juha-Pekka Pellonpaa %J Physics %D 2001 %I arXiv %R 10.1238/Physica.Regular.066a00066 %X We compare the Pegg-Barnett (PB) formalism with the covariant phase observable approach to the problem of quantum phase and show that PB-formalism gives essentially the same results as the canonical (covariant) phase observable. We also show that PB-formalism can be extended to cover all covariant phase observables including the covariant phase observable arising from the angle margin of the Husimi Q-function. %U http://arxiv.org/abs/quant-ph/0106084v1