Št. zadetkov: 13
Izvirni znanstveni članek
Oznake:
kvantna mehanika;fizika kondenzirane snovi;quantum mechanics;condensed matter physics;
The effects of a local magnetic field on nonequilibrium stationary states (NESSs) of the open quantum XXZ spin chain are investigated with a Lindblad master equation approach in the limit of strong dissipation. The local magnetic field is applied to a single bulk spin of the chain while the ends are ...
Leto:
2019
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
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Oznake:
kvantna mehanika;odprti kvantni sistemi;nelinearna dinamika;quantum mechanics;open quantum systems;nonlinear dynamics;
We consider an open quantum system with dissipation, described by a Lindblad Master equation (LME). For dissipation locally acting and sufficiently strong, a separation of the relaxation timescales occurs, which, in terms of the eigenvalues of the Liouvillian, implies a grouping of the latter in dis ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;kvantna vezja;odprti kvantni sistemi;quantum mechanics;quantum circuits;open quantum systems;
We propose a spatially inhomogeneous matrix product Ansatz for an exact many-body density operator of a boundary-driven $XXZ$ quantum circuit. The Ansatz has formally infinite bond dimension and is fundamentally different from previous constructions. The circuit is driven by a pair of reset quantum ...
Leto:
2025
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;neravnovesna statistična mehanika;odprti kvantni sistemi;statistical physics;nonequilibrium statistical mechanics;open quantum systems;
We investigate a dissipatively driven XYZ spin-1/2 chain in the Zeno limit of strong dissipation, described by Lindblad master equation. The nonequilibrium steady state is expressed in terms of a matrix product ansatz using novel site-dependent Lax operators. The components of Lax operators satisfy ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;odprti kvantni sistemi;kvantne spinske verige;statistical physics;open quantum systems;quantum spin chains;
We find novel site-dependent Lax operators in terms of which we demonstrate exact solvability of a dissipatively driven XYZ spin-1/2 chain in the Zeno limit of strong dissipation, with jump operators polarizing the boundary spins in arbitrary directions. We write the corresponding nonequilibrium ste ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;quantum mechanics;
We demonstrate the existence of a special chiral “phantom” mode with some analogy to a Goldstone mode in the anisotropic quantum XXZ Heisenberg spin chain. The phantom excitations contribute zero energy to the eigenstate, but a finite fixed quantum of momentum $k_0$. The mode exists not due to symme ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Magistrsko delo
Oznake:
celični avtomati;dinamični sistem Box-Ball;solitoni;stacionarno stanje;Schmidtovi ranki;korelacije;pomožni prostor;parcialne matrike;
V magistrskem delu je predstavljen deterministični dinamični sistem Box-Ball (BBS), sklopljen s stohastičnim Markovskim rezervoarjem. Rezervoar predstavlja robni pogoj, kjer stohastično nastajajo žoge v sistemu. Dinamika tega sklopljenega sistema je drugačna od klasičnega BBS in zato potrebujemo def ...
Leto:
2024
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;fizika kondenzirane snovi;spinske verige;statistical physics;condensed matter physics;spin chains;
We describe the dynamics of a transverse spin-helix state—a product state with spatially rotating magnetization—under XXZ spin chain evolution. Due to experimental relevance we especially focus on magnetization dynamics. At long times the $U$(1) symmetry of the Hamiltonian is restored, leading to th ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
neravnovesna statistična mehanika;kvantna statistična mehanika;odprti kvantni sistemi;nonequilibrium statistical mechanics;quantum statistical mechanics;open quantum systems;
We analytically investigate the Liouvillian exceptional point manifolds (LEPMs) of a two-qubits open system, where one qubit is coupled to a dissipative polarization bath. Exploiting a $Z_2$ symmetry, we block diagonalize the Liouvillian and show that one symmetry block yields two planar LEPMs while ...
Leto:
2025
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;odprti kvantni sistemi;markovski procesi;quantum mechanics;open quantum systems;Markov processes;
We consider an open quantum system, with dissipation applied only to a part of its degrees of freedom, evolving via a quantum Markov dynamics. We demonstrate that, in the Zeno regime of large dissipation, the relaxation of the quantum system towards a pure quantum state is linked to the evolution of ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)