Št. zadetkov: 8
Izvirni znanstveni članek
Oznake:
kvantna mehanika;odprti kvantni sistemi;statistična fizika;quantum mechanics;open quantum systems;statistical physics;
We consider a collective quantum spin s in contact with Markovian spin-polarized baths. Using a conserved superoperator charge, a differential representation of the Liouvillian is constructed to find its exact spectrum and eigenmodes. We study the spectral properties of the model in the large-s limi ...
Leto:
2019
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
nelinearna dinamika;statistična fizika;kvantni kaos;nonlinear dynamics;statistical physics;quantum chaos;
We introduce a complex-plane generalization of the consecutive level-spacing ratio distribution used to distinguish regular from chaotic quantum spectra. Our approach features the distribution of complex-valued ratios between nearest- and next-to-nearest-neighbor spacings. We show that this quantity ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
odprti kvantni sistemi;kvantni kaos;open quantum systems;quantum chaos;
We study generic open quantum systems with Markovian dissipation, focusing on a class of stochastic Liouvillian operators of Lindblad form with independent random dissipation channels (jump operators) and a random Hamiltonian. We establish that the global spectral features, the spectral gap, and the ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;kvantna mehanika;odprti kvantni sistemi;statistical physics;quantum mechanics;open quantum systems;
We explicitly construct an integrable and strongly interacting dissipative quantum circuit via a trotterization of the Hubbard model with imaginary interaction strength. To prove integrability, we build an inhomogeneous transfer matrix, from which conserved superoperator charges can be derived, in p ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
fizika kondenzirane snovi;močno korelirani sistemi;kvantni kaos;condensed matter physics;strongly-correlated systems;quantum chaos;
We propose the Sachdev-Ye-Kitaev Lindbladian as a paradigmatic solvable model of dissipative many-body
quantum chaos. It describes N strongly coupled Majorana fermions with random all-to-all interactions, with
unitary evolution given by a quartic Hamiltonian and the coupling to the environment des ...
Leto:
2022
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
fizika kondenzirane snovi;kvantna statistična mehanika;condensed matter physics;quantum statistical mechanics;
We perform a systematic symmetry classification of many-body Lindblad superoperators describing general (interacting) open quantum systems coupled to a Markovian environment. Our classification is based on the behavior of the many-body Lindbladian under antiunitary symmetries and unitary involutions ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
neravnovesna statistična mehanika;odprti kvantni sistemi;nonequilibrium statistical mechanics;open quantum systems;
The study of dissipation and decoherence in generic open quantum systems recently led to the investigation of spectral and steady-state properties of random Lindbladian dynamics. A natural question is then how realistic and universal those properties are. Here, we address these issues by considering ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična mehanika;disipativni sistemi;ergodičnost;odprti kvantni sistemi;statistical mechanics;dissipative systems;ergidicity;open quantum systems;
We study spectral and steady-state properties of generic Markovian dissipative systems described by quadratic fermionic Liouvillian operators of the Lindblad form. The Hamiltonian dynamics is modeled by a generic random quadratic operator, i.e., as a featureless superconductor of class D, whereas th ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)