期刊
PHYSICAL REVIEW A
卷 91, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.91.033837
关键词
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资金
- Ministry of Education, Youth and Sports of the Czech Republic [LO1305]
- IGA UP Olomouc [IGA_PrF_2015004]
- GA CR [P205/12/0382]
- Polish National Science Centre [DEC-2011/03/B/ST2/01903, DEC-2011/02/A/ST2/00305]
The nonclassicality, entanglement, and dimensionality of a noisy twin beam are determined using a characteristic function of the beam written in the Fock basis. One-to-one correspondence between the negativity quantifying entanglement and the nonclassicality depth is revealed. Twin beams, which are either entangled or nonclassical (independent of their entanglement), are observed only for the limited degrees of noise, which degrades their quantumness. The dimensionality of the twin beam quantified by the participation ratio is compared with the dimensionality of entanglement determined from the negativity. Partitioning of the degrees of freedom of the twin beam into those related to entanglement and to noise is suggested. Both single-mode and multimode twin beams are analyzed. Weak nonclassicality based on integrated-intensity quasidistributions of multimode twin beams is studied. The relation of the model to the experimental twin beams is discussed.
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