Št. zadetkov: 31
Izvirni znanstveni članek
Oznake:
kvantna mehanika;prepletenost;statistična mehanika;fizika kondenzirane snovi;quantum mechanics;entanglement;statistical mechanics;condensed matter physics;
Entanglement helps in understanding diverse phenomena, going from quantifying complexity to classifying phases of matter. Here we study the influence of conservation laws on entanglement growth. Focusing on systems with U(1) symmetry, i.e., conservation of charge or magnetization, that exhibits diff ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;kvantna mehanika;statistical physics;quantum mechanics;Floquet systems;complexity dynamics;
We want to understand how relaxation process from an initial non-generic state proceeds towards a long-time typical state reached under unitary quantum evolution. One would expect that after some initial correlation time relaxation will be a simple exponential decay with constant decay rate. We show ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;quantum mechanics;
Phantom relaxation is relaxation with a rate that is not given by a finite spectral gap. Studying the average purity dynamics in a staircase random Haar circuit and the spectral decomposition of a nonsymmetric matrix describing the underlying Markovian evolution, we explain how that can arise out of ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
fizika kondenzirane snovi;statistična fizika;kvantne spinske verige;neravnovesni sistemi;condensed matter physics;statistical physics;quantum spin chains;nonequilibrium systems;
We study a recently discussed XX spin chain with nonlocal dephasing [Y.-P. Wang etal., arXiv:2310.03069] in a steady-state boundary-driven setting, confirming superdiffusive magnetization transport in the thermodynamic limit. The emergence of superdiffusion is rather interesting as the Lindblad oper ...
Leto:
2024
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
fizika kondenzirane snovi;kvantna mehanika;večdelčne lokalizacije;transport;kvaziperiodični sistemi;condensed matter physics;quantum mechanics;many-body localization;quasiperiodic systems;
Integrable models form pillars of theoretical physics because they allow for full analytical understanding. Despite being rare, many realistic systems can be described by models that are close to integrable. Therefore, an important question is how small perturbations influence the behavior of solvab ...
Leto:
2018
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Doktorska disertacija
Oznake:
transport;spinske verige;integrabilnost;nered;balistični transport;superdifuzija;difuzija;kvaziperiodičnost;Floquet;Drudejeva utež;defekt;
In this thesis we present research on one-dimensional quantum systems performed using a combination of numerical and analytic techniques, with a particular focus on spin transport. We first review the numeric and analytic methods used in our works and present some of the useful tricks we have employ ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Magistrsko delo
Oznake:
naključna kvantna vezja;prepletenost;kubiti;optimizacija;Markovska veriga;spektralna reža;
Naključna kvantna vezja uporabljamo kot model za opisovanje raznoraznih nedeterminističnih fizikalnih pojavov, saj služijo kot dobra aproksimacija naključnih unitarnih operatorjev in naključnih kvantnih stanj. Slednje se v fiziki uporablja na mnogih področjih zaradi njihove velike prepletenosti. V s ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;kvantna fizika;statistical physics;quantum physics;
We study random quantum circuits and their rate of producing bipartite entanglement, specifically with respect to the choice of 2-qubit gates and the order (protocol) in which these are applied. The problem is mapped to a Markovian process, and we prove that there are large spectral equivalence clas ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Magistrsko delo
Oznake:
kvantni kaos;teorija naključnih matrik;spektralna statistika;Floquetovi sistemi;kubitna vezja;simetrije;prostorsko-časovne simetrije;zlom simetrij;
V magistrskem delu analiziramo indikatorje kvantnega kaosa v kubitnih vezjih z enostavnimi geometrijami, sestavljenimi iz več enakih dvodelčnih vrat, ki služijo kot model 1-dimenzionalnih kvantnih sistemov. Osredotočimo se na porazdelitev kvazi-energijskih razmikov, pri kateri je za razumevanje klju ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
fizika kondenzirane snovi;neurejeni sistemi;odprti kvantni sistemi;condensed matter physics;disordered systems;open quantum systems;
The relaxation of observables to their nonequilibrium steady states in a disordered XX chain subjected to dephasing at every site has been intensely studied in recent years. We comprehensively analyze the relaxation of staggered magnetization, i.e., imbalance, in such a system, starting from the Née ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)