5 papers
Improving quantum-battery charging via unidirectional quantum jumps to metastable state
Ewelina Lange, Grzegorz Chimczak, Anna Kowalewska-Kudłaszyk +2
In the process of charging a quantum battery, quantum jumps play a detrimental role because they induce transitions from higher to lower energy levels, leading to energy dissipatio…
Multiple quantum exceptional, diabolical, and hybrid points in multimode bosonic systems: II. Nonconventional PT-symmetric dynamics and unidirectional coupling
Jan PeÅina, Kishore Thapliyal, Grzegorz Chimczak +2
We analyze the existence and degeneracies of quantum exceptional, diabolical, and hybrid points in simple bosonic systems - comprising up to six modes with damping and/or amplifica…
Multiple quantum exceptional, diabolical, and hybrid points in multimode bosonic systems: I. Inherited and genuine singularities
Kishore Thapliyal, Jan PeÅina, Grzegorz Chimczak +2
The existence and degeneracies of quantum exceptional, diabolical, and hybrid (i.e., diabolically degenerated exceptional) singularities of simple bosonic systems composed of up to…
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, 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…