Physics – Quantum Physics
Scientific paper
2009-03-05
J. Russ. Laser Res., 28, 516 (2007)
Physics
Quantum Physics
14 pages, 11 figures
Scientific paper
10.1007/s10946-007-0039-y
The known Peres-Horodecki criterion and scaling criterion of separability are considered on examples of three-mode and four-mode Gaussian states of electromagnetic field. It is shown that the principal minors of the photon quadrature dispersion matrix are sensitive to the change of scaling parameters. An empirical observation has shown that the bigger the modulus of negative principal minors, the more entangled the state.
Man'ko Vladimir I.
Sergeevich Alexandr A.
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