277 citations · 916 across the 20 of their papers we have counts for
20 papers
Variational ground-state quantum adiabatic theorem
Bojan Žunkovič, Pietro Torta, Giovanni Pecci +2
We present a variational quantum adiabatic theorem, which states that, under certain assumptions, the adiabatic dynamics projected onto a variational manifold follow the instantane…
Mean-field approach to Mid-spectrum Eigenstates of long-range interacting Quantum Systems
Bojan Žunkovič, Pedro Ribeiro
We study the equilibrium properties of the spin- XY chain with an infinite-range transverse interaction. At zero temperature, competition between the XY- and the -ordered p…
Mean-field dynamics of an infinite-range interacting quantum system: chaos, dynamical phase transition, and localisation
Bojan Žunkovič, Antonio Zegarra
We investigate the dynamical properties of the XY spin 1/2 chain with infinite-range transverse interactions and find a dynamical phase transition with a chaotic dynamical phase. I…
Positive unlabeled learning with tensor networks
Bojan Žunkovič
Positive unlabeled learning is a binary classification problem with positive and unlabeled data. It is common in domains where negative labels are costly or impossible to obtain, e…
Grokking phase transitions in learning local rules with gradient descent
Bojan Žunkovič, Enej Ilievski
We discuss two solvable grokking (generalisation beyond overfitting) models in a rule learning scenario. We show that grokking is a phase transition and find exact analytic express…
Deep tensor networks with matrix product operators
Bojan Žunkovič
We introduce deep tensor networks, which are exponentially wide neural networks based on the tensor network representation of the weight matrices. We evaluate the proposed method o…
Dynamical Phase Diagram of a Quantum Ising Chain with Long Range Interactions
Giulia Piccitto, Bojan Žunkovič, Alessandro Silva
We investigate the effect of short-range correlations on the dynamical phase diagram of quantum many-body systems with long-range interactions. Focusing on Ising spin chains with p…
Quasi-localized excitations induced by long-range interactions in translationally-invariant quantum spin chains
Alessio Lerose, Bojan Zunkovic, Alessandro Silva +1
We show that long-range ferromagnetic interactions in quantum spin chains can induce spatial quasi-localization of topological magnetic defects, i.e., domain-walls, even in the abs…
Impact of non-equilibrium fluctuations on pre-thermal dynamical phase transitions in long-range interacting spin chains
Alessio Lerose, Bojan Zunkovic, Jamir Marino +2
We study the non-equilibrium phase diagram and the dynamical phase transitions occurring during the pre-thermalization of non-integrable quantum spin chains, subject to either quan…
Chaotic dynamical ferromagnetic phase induced by non-equilibrium quantum fluctuations
A. Lerose, J. Marino, B. Zunkovic +2
We investigate the robustness of a dynamical phase transition against quantum fluctuations by studying the impact of a ferromagnetic nearest-neighbour spin interaction in one spati…
Dynamical Quantum Phase Transitions in Spin Chains with Long-Range Interactions: Merging different concepts of non-equilibrium criticality
Bojan Zunkovic, Markus Heyl, Michael Knap +1
We theoretically study the dynamics of a transverse-field Ising chain with power-law decaying interactions characterized by an exponent , which can be experimentally realized in…
The Molecular Photo-Cell: Quantum Transport and Energy Conversion at Strong Non-Equilibrium
Shigeru Ajisaka, Bojan Zunkovic, Yonatan Dubi
Non-equilibrium transport properties and energy conversion performance of a molecular photo-voltaic cell are analyzed using the Lindblad master equation within the open quantum sys…
Nonequilibrium Quantum Phase Transitions in the XY model: comparison of unitary time evolution and reduced density matrix approaches
Shigeru Ajisaka, Felipe Barra, Bojan Žunkovič
We study nonequilibrium quantum phase transitions in XY spin 1/2 chain using the algebra. We show that the well-known quantum phase transition at magnetic field persi…
Quantum group approach to steady states of boundary-driven open quantum systems
Enej Ilievski, Bojan Žunkovič
We present a systematic approach for constructing steady state density operators of Markovian dissipative evolution for open quantum chain models with integrable bulk interaction a…
Macroscopic Diffusive Transport in a Microscopically Integrable Hamiltonian System
Tomaz Prosen, Bojan Zunkovic
We demonstrate that a completely integrable classical mechanical model, namely the lattice Landau-Lifshitz classical spin chain, supports diffusive spin transport with a finite dif…
Markovian kinetic equation approach to electron transport through quantum dot coupled to superconducting leads
Daniel S. Kosov, Tomaž Prosen, Bojan Žunkovič
We present a derivation of Markovian master equation for the out of equilibrium quantum dot connected to two superconducting reservoirs, which are described by the Bogoliubov-de Ge…
Transport properties of a boundary-driven one-dimensional gas of spinless fermions
Marko Znidaric, Bojan Zunkovic, Tomaz Prosen
We analytically study a system of spinless fermions driven at the boundary with an oscillating chemical potential. Various transport regimes can be observed: at zero driving freque…
Lindblad master equation approach to superconductivity in open quantum systems
Daniel S. Kosov, Tomaz Prosen, Bojan Zunkovic
We consider an open quantum Fermi-system which consists of a single degenerate level with pairing interactions embedded into a superconducting bath. The time evolution of the reduc…
Explicit solution of the Lindblad equation for nearly isotropic boundary driven XY spin 1/2 chain
Bojan Zunkovic, Tomaz Prosen
Explicit solution for the 2-point correlation function in a non-equilibrium steady state of a nearly isotropic boundary-driven open XY spin 1/2 chain in the Lindblad formulation is…
Exact solution of Markovian master equations for quadratic fermi systems: thermal baths, open XY spin chains, and non-equilibrium phase transition
Tomaz Prosen, Bojan Zunkovic
We generalize the method of third quantization to a unified exact treatment of Redfield and Lindblad master equations for open quadratic systems of n fermions in terms of diagonali…