arXiv subjects

D. Chevizovich

Publications and source records attributed to D. Chevizovich.

5 recordsLinked to original sources

arXiv2026

Coherent migration of the single excitation injected into finite-length segment of the biomolecular chain

We study the migration of a single excitation excited at a structural element of a finite molecular segment, which is a part of a long biomolecular chain. The excitation cannot leave the segment and is locally coupled to thermal vibrations of the lattice, forming a self-trapped state corresponding to a nonadiabatic polaron. The time-dependent probability distribution of finding the excitation at the nodes of the segment is calculated, with particular emphasis on the role of the initial excitation position. A formal analogy is observed between the present model and continuous-time quantum walk models on finite chains with reflecting boundaries. The results reveal an asymmetry in the probability distribution for nodes symmetrically positioned with respect to the initially excited site, which arises solely from the asymmetric placement of the initial excitation within the finite segment. The only exception occurs when the initially excited node is located at the center of the segment, where the probability distribution becomes symmetric. The complex interference pattern and the absence of well-defined revivals stem from the non-equidistant spectrum of mode frequencies, leading to progressive dephasing of the constituent modes. As a result, the initially well-localized probability maximum fragments into one dominant maximum accompanied by several secondary maxima of lower intensity. These findings highlight the importance of boundary conditions and initial-state geometry in controlling quantum transport in finite molecular systems.

cond-mat.other↗

arXiv2025

Microwave pulse transparency in Flux-qubit based superconducting quantum metamaterial

We consider the propagation of a classical microwave pulse through a simple setup of a quantum metamaterial composed of a large number of three-Josephson-junction flux qubits. We find that population inversion and electromagnetic waves propagate together as two-component nonlinear waves, exhibiting distinct features depending on the initial preparation of the qubit subsystem and the strength of the "matter"-light interaction. Three different regimes are observed. In the limit of weak nonlinearity, when all qubits are initially prepared in either the clockwise or counterclockwise persistent current state, population inversion undergoes coherent Rabi-like oscillations, with a complete transfer between these two opposite states. As nonlinearity approaches unity, the transition dynamics lose their oscillatory nature, and the system rapidly becomes frozen in a state of zero population inversion, where each qubit is trapped in a superposition with equal probabilities of clockwise and counterclockwise polarity. In the overcritical regime, population inversion exhibits pulsating behavior, but without complete transfer. In the extreme coupling limit, population inversion undergoes small-amplitude oscillations around its initial value, while the pulse amplitude oscillates around zero, indicating pulse stopping.

cond-mat.other↗

arXiv2023

On the influence of the "donor"/"acceptor" presence on the excitation states in molecular chains: non-adiabatic polaron approach

In the paper, we considered a molecular structure that consists of a molecular chain and an additional molecule ("donor"/"acceptor") that can inject (or remove) single excitation (vibron, electron, e.t.c.) onto the molecular chain. We assumed that the excitation forms a self-trapped state due to the interaction with mechanical oscillations of chain structure elements. We analyzed the energy spectra of the excitation and showed that its state (when it migrates to the molecular chain) has the properties of the non-adiabatic polaron state. The conditions under which the excitation can migrate from one subsystem to another were considered. It was shown that the presence of a "donor" molecule cannot significantly change the properties of the excitation located on the molecular chain. At the same time, the molecular chain can affect the position of the energy level of the excitation localized on the "donor" subsystem. Indirectly, this can influence the process of excitation migration from one subsystem to another one. The influence of basic energy parameters of the system and the environment temperature on this process are discussed. The entire system was assumed to be in thermal equilibrium with the environment.

cond-mat.mes-hall↗

arXiv2023

Electromagnetic pulse transparency in coupled cavity arrays through dispersion management

We theoretically demonstrated the possible emergence of slow-light self-induced transparency solitons in the infinite one-dimensional coupled cavity array, with each cavity containing a single qubit. We have predicted a substantial dependence of pulse transparency on its dimensionless width $τ_0$. In particular, short pulses whose widths range from $τ_0\ll 1$ to $τ_0\lesssim 1$ exhibit simple, almost linear dispersion law with a finite frequency gap of the order of the cavity array photonic band gap. That is, the medium is opaque for very short pulses with carrier wave frequency below the photonic gap. When the pulse width exceeds the critical one, a twin transparency window separated by a finite band gap appears in the soliton pulse dispersion law. Observation of predicted effects within the proposed setup would be of interest for understanding the properties of self-induced transparency effect in general and future applications in the design of quantum technological devices.

physics.optics↗

arXiv2021

Qubit-Photon Bound States in Superconducting Metamaterials

We study quantum features of electromagnetic radiation propagating in the one-dimensional superconducting quantum metamaterial comprised of an infinite chain of charge qubits placed within two-stripe massive superconductive resonators. The Quantum-mechanical model is derived assuming weak fields and that, at low temperatures, each qubit is either unoccupied ($N=0$) or occupied by a single Cooper pair ($N=1$). Based on this assumption we demonstrate the emergence of two bands of single-photon-qubit bound states with the energy lying within (lower branch) or outside (higher) the photon continuum. The emergence of bound states may cause radiation trapping which could be of interest for the control of photon transport in these systems.

quant-ph↗