4 papers
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…
Liouvillian and Hamiltonian exceptional points of atomic vapors: The spectral signatures of quantum jumps
Marek Kopciuch, Adam Miranowicz
We investigate spectral singularities in an alkali-metal atomic vapor modeled using four and effectively three hyperfine states. By comparing the eigenvalue spectra of a non-Hermit…
Enhanced quantum sensing with hybrid exceptional-diabolic singularities
Javid Naikoo, Ravindra W. Chhajlany, Adam Miranowicz
We report an enhanced sensitivity for detecting linear perturbations near hybrid (doubly degenerated) exceptional-diabolic (HED) singular points in a four mode bosonic system. The…
Dynamically Encircled Higher-order Exceptional Points in an Optical Fiber
Arpan Roy, Arnab Laha, Abhijit Biswas +3
The unique properties of exceptional point (EP) singularities, arising from non-Hermitian physics, have unlocked new possibilities for manipulating light-matter interactions. A tai…