48 citations · 135 across the 12 of their papers we have counts for
12 papers
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…
Chaotic evolution of the energy of the electron orbital and the hopping integral in diatomic molecule cations subjected to harmonic excitation
I. A. Domagalska, M. W. Jarosik, A. P. Durajski +2
We analysed the dynamics of the positively charged ions of diatomic molecules ( and ), in which the bond is realised by the single electron. We assum…
Anomalously high value of Coulomb pseudopotential for the superconductor
Małgorzata Kostrzewa, Radosław Szczęśniak, Joanna K. Kalaga +1
The and compounds are the two candidates for the low-temperature phase of compressed sulfur-hydrogen system. We have shown that the value of Coulo…
Characteristics of superconducting state in vanadium: the Eliashberg equations and semi-analytical formulas
E. A. Drzazga, I. A. Domagalska, M. W. Jarosik +2
The superconducting state in vanadium characterizes with the critical temperature () equal to ~K. The Coulomb pseudopotential, calculated with the help of the Eliashber…
Quantum correlations and entanglement in a model comprised of a short chain of nonlinear oscillators
J. K. Kalaga, A. Kowalewska-Kudłaszyk, W. Leoński +1
We discuss a model comprised of a chain of three Kerr-like nonlinear oscillators pumped by two modes of external coherent field. We show that the system can be treated as nonlinear…
Kullback-Leibler quantum divergence as an indicator of quantum chaos
A. Kowalewska-Kudłaszyk, J. K. Kalaga, W. Leoński +1
We discuss a system of a nonlinear Kerr-like oscillator externally pumped by ultra-short, external, coherent pulses. For such a system, we analyse the application of the Kullback-L…
Wigner function non-classicality as indicator of quantum chaos
A. Kowalewska-Kudłaszyk, J. K. Kalaga, W. Leoński
We propose a Wigner function based parameter that can be used as an indicator of quantum chaos. This parameter is defined as "entropy" from the time-dependence of "non-classicallit…
Long-time fidelity and chaos for a kicked nonlinear oscillator system
A. Kowalewska-Kudłaszyk, J. K. Kalaga, W. Leoński
We deal with a system comprising a nonlinear (Kerr-like) oscillator excited by a series of ultra-short external pulses. We introduce the fidelity-based entropic parameter that can…