12 citations · 15 across the 3 of their papers we have counts for
7 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…
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…
Multiple quantum exceptional, diabolical, and hybrid points in multimode bosonic systems: II. Nonconventional PT-symmetric dynamics and unidirectional coupling
Jan Peřina, 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 Peřina, 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…
The effect of thermal photons on exceptional points in coupled resonators
Grzegorz Chimczak, Anna Kowalewska-Kudłaszyk, Ewelina Lange +2
We analyse two quantum systems with hidden parity-time (PT) symmetry: one is an optical device, whereas another is a superconducting microwave-frequency device. To investigate thei…
Rotation-time symmetry in bosonic systems and the existence of exceptional points in the absence of symmetry
Ewelina Lange, Grzegorz Chimczak, Anna Kowalewska-Kudłaszyk +1
We study symmetries of open bosonic systems in the presence of laser pumping. Non-Hermitian Hamiltonians describing these systems can be parity-time () symmetric in spe…