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54 papers · 1 filter
Nonreciprocal flow of fluctuations, populations and correlations between doubly coupled bosonic modes
Zbigniew Ficek
Interesting new correlation and unidirectional properties of two bosonic modes under the influence of environment appear when the modes are mutually coupled through the simultaneou…
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…
On the Weak Point of the Stronger Uncertainty Relation
K. Urbanowski
We analyze the uncertainty relation for the sum of variances, which is called in some papers, the stronger uncertainty relation for all incompatible observables. We show that this…
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…
On some states minimizing uncertainty relations: A new look at these relations
Krzysztof Urbanowski
Analyzing Heisenberg--Robertson (HR) and Schrödinger uncertainty relations we found, that there can exist a large set of states of the quantum system under considerations, for whic…