3 papers
quant-ph2025
Quantumness and its hierarchies in PT-symmetric down-conversion models
Jan PeÅina, 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…
quant-ph2025
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…
quant-ph2025
W-class states-identification and quantification of Bell-CHSH inequalities' violation
Joanna K. Kalaga, WiesÅaw LeoÅski, Jan PeÅina
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…