78 citations · 457 across the 20 of their papers we have counts for
20 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…
Hybrid photon-phonon blockade
Shilan Abo, Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk +3
We describe a novel type of blockade in a hybrid mode generated by linear coupling of photonic and phononic modes. We refer to this effect as hybrid photon-phonon blockade and show…
Quantum Liouvillian exceptional and diabolical points for bosonic fields with quadratic Hamiltonians: The Heisenberg-Langevin equation approach
Jan Perina, Adam Miranowicz, Grzegorz Chimczak +1
Equivalent approaches to determine eigenfrequencies of the Liouvillians of open quantum systems are discussed using the solution of the Heisenberg-Langevin equations and the corres…
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…
Equilibrium frame reveals hidden PT symmetry of passive systems
Grzegorz Chimczak, Anna Kowalewska-Kudłaszyk, Ewelina Lange +1
We discuss how introducing an equilibrium frame, in which a given Hamiltonian has balanced loss and gain terms, can reveal PT symmetry hidden in non-Hermitian Hamiltonians of dissi…
Two-photon blockade and photon-induced tunneling generated by squeezing
Anna Kowalewska-Kudlaszyk, Shilan Ismael Abo, Grzegorz Chimczak +3
Inspired by the recent experiment of Hamsen et al. [Phys. Rev. Lett. 118, 133604 (2017)], which demonstrated two-photon blockade in a driven nonlinear system (composed of a harmoni…
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…
Nonlinear coupler operating on Werner-like states - entanglement creation, its enhancement and preservation
A. Kowalewska-Kudłaszyk, W. Leoński
We discuss a model of two nonlinear Kerr-like oscillators, mutually coupled and excited by parametric process. We show that the system's evolution, starting from Werner-like states…
Kicked nonlinear quantum scissors and entanglement generation
A. Kowalewska-Kudłaszyk, W. Leoński, T. Dung Nguyen +1
We consider a nonlinear coupler with two Kerr-like oscillators mutually coupled by continuous linear interaction and excited by a series of ultra-short external pulses. We show tha…
Quantum scissors - finite-dimensional states engineering
W. Leoński, A. Kowalewska-Kudłaszyk
This work discusses quantum states defined in a finite-dimensional Hilbert space. In particular, after the presentation of some of them and their basic properties the work concentr…
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…
Squeezed vacuum reservoir effect for entanglement decay in nonlinear quantum scissors system
A. Kowalewska-Kudłaszyk, W. Leoński
We discuss the coupler system of two nonlinear oscillators excited by an external coherent field prepared in a maximally entangled state (Bell-like state). We show that as a result…
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…
Sudden Death and Birth of Entanglement Effects for Kerr-Nonlinear Coupler
A. Kowalewska-Kudłaszyk, W. Leoński
We analyse the entanglement dynamics in a nonlinear Kerr-like coupler interacting with external environment. Whenever the reservoir is in a thermal vacuum state the entanglement (m…
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…
Finite-dimensional states and entanglement generation for a nonlinear coupler
A. Kowalewska-Kudłaszyk, W. Leoński
We discuss a system comprising two nonlinear (Kerr-like) oscillators coupled mutually by a nonlinear interaction. The system is excited by an external coherent field that is resona…