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Quantumness and its hierarchies in PT-symmetric down-conversion models
Jan Peřina, Karol Bartkiewicz, Grzegorz Chimczak +4
We investigate the hierarchy of quantum correlations in a quadratic bosonic parity-time-symmetric system (PTSS) featuring distinct dissipation and amplification channels. The hiera…
Two- and three-mode squeezing in a three-qubit entangled system
Joanna K. Kalaga, Jan Perina
The states of a three-mode bosonic system with the restricted Hilbert space are discussed in the context of quantum entanglement and squeezing of quantum fluctuations. The states e…
W-class states-identification and quantification of Bell-CHSH inequalities' violation
Joanna K. Kalaga, Wiesław Leoński, Jan Peřina
We discuss a family of W-class states describing three-qubit systems. For such systems, we analyze the relations between the entanglement measures and the nonlocality parameter for…
Unavoidability of nonclassicality loss in PT-symmetric systems
Jan Perina, Adam Miranowicz, Joanna K. Kalaga +1
We show that the loss of nonclassicality (including quantum entanglement) cannot be compensated by the (incoherent) amplification of PT-symmetric systems. We address this problem b…
Nonclassical light at exceptional points of a quantum PT-symmetric two-mode system
Jan Perina, Antonin Luks, Joanna K. Kalaga +2
A two-mode optical parity-time (PT) symmetric system, with gain and damping, described by a quantum quadratic Hamiltonian with additional small Kerr-like nonlinear terms, is analyz…