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Nonclassicality, entanglement, as well as dimensionality of a noisy twin beamare determined using characteristic function of the beam written in the Fockbasis. One-to-one correspondence between the negativity quantifyingentanglement and the nonclassicality depth is revealed. Twin beams, which areeither entangled or nonclassical (independent of their entanglement), areobserved only for the limited degrees of noise that degrades their quantumness.Dimensionality of the twin beam quantified by the participation ratio iscompared with the dimensionality of entanglement determined from thenegativity. The partition of the degrees of freedom of the twin beam into thoserelated to entanglement and to noise is suggested. Both single-mode andmultimode twin beams are analyzed. Weak nonclassicality based onintegrated-intensity quasidistributions of multimode twin beams is studied.Relation of the model to the experimental twin beams is discussed.

Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams