Alexander N. Poddubny
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View article: Parametric resonant enhancement of motional entanglement under optimal control: an analytical study
Parametric resonant enhancement of motional entanglement under optimal control: an analytical study Open
We study theoretically continuous-variable entanglement between the motional degrees of freedom of optically trapped massive particles coupled via the Coulomb interaction, in the presence of a feedback control scheme. We perform a detailed…
View article: No oscillating subradiant correlations in a strongly driven quantum emitter array
No oscillating subradiant correlations in a strongly driven quantum emitter array Open
We theoretically study time-dependent correlations in a strongly driven array of $N$ two-level atoms, coupled to photons in a waveguide. We focus on the spectrum $\{λ\}$ of the Liouvillian superoperator, which determines the correlation de…
View article: Persistent subradiant correlations in a random driven Dicke model
Persistent subradiant correlations in a random driven Dicke model Open
We study theoretically the driven-dissipative dynamics of an array of two-level emitters, coupled to a single photonic mode, in the presence of disorder in the resonant frequencies. We introduce the notion of subradiant correlations in the…
View article: Multiband dispersion and warped vortices of strongly-interacting photons
Multiband dispersion and warped vortices of strongly-interacting photons Open
We study quantum correlations between interacting photons realized through co-propagating Rydberg polaritons. We show that the evolution of the $n$-photon wavefunction is governed by a multiband dispersion featuring one massive mode and $n…
View article: Van der Waals interactions in linear chains with long-range correlated disorder
Van der Waals interactions in linear chains with long-range correlated disorder Open
We present a theoretical study of van der Waals interaction forces in disordered linear molecule chains. We demonstrate that the interaction energy strongly and nonmonotonously depends on the disorder correlation length. Semianalytical exp…
View article: Chiral Dissociation of Bound Photon Pairs for a Non-Hermitian Skin Effect
Chiral Dissociation of Bound Photon Pairs for a Non-Hermitian Skin Effect Open
We theoretically study the bound states of interacting photons propagating in a waveguide chirally coupled to an array of atoms. We demonstrate that the bound photon pairs can concentrate at the edge of the array and link this to the non-H…
View article: Topological nature of edge states for one-dimensional systems without symmetry protection
Topological nature of edge states for one-dimensional systems without symmetry protection Open
We numerically verify and analytically prove a winding number invariant that correctly predicts the number of edge states in one-dimensional, nearest-neighbor (between unit cells), two-band models with any complex couplings and open bounda…
View article: Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling
Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling Open
We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. This motion can be implemented mechanically or simulated via the modulation of the couplings between the qubits and the waveguide. When the…
View article: Van der Waals interactions in linear chains with long-range correlated disorder
Van der Waals interactions in linear chains with long-range correlated disorder Open
We present a theoretical study of van der Waals interaction forces in disordered linear molecule chains. We demonstrate that the interaction energy strongly and nonmonotonously depends on the disorder correlation length. Semianalytical exp…
View article: Nonequilibrium entanglement between levitated masses under optimal control
Nonequilibrium entanglement between levitated masses under optimal control Open
We present a protocol that maximizes unconditional entanglement generation between two masses interacting directly through $1/r^{n}$ potential. The protocol combines optimal quantum control of continuously measured masses with their non-eq…
View article: Multimer states in multilevel waveguide QED
Multimer states in multilevel waveguide QED Open
We study theoretically the interplay of spontaneous emission and interactions for the multiple-excited quasistationary eigenstates in a finite periodic array of multilevel atoms coupled to the waveguide. We develop an analytical approach t…
View article: How single-photon nonlinearity is quenched with multiple quantum emitters: Quantum Zeno effect in collective interactions with $Λ$-level atoms
How single-photon nonlinearity is quenched with multiple quantum emitters: Quantum Zeno effect in collective interactions with $Λ$-level atoms Open
Single-photon nonlinearity, namely the change in the response of the system as the result of the interaction with a single photon, is generally considered an inherent property of a single quantum emitter. Understanding the dependence of th…
View article: Mesoscopic non-Hermitian skin effect
Mesoscopic non-Hermitian skin effect Open
We discuss a generalization of the non-Hermitian skin effect to finite-size photonic structures with neither gain nor loss in the bulk and purely real energy spectrum under periodic boundary conditions (PBC). We show that such systems can …
View article: Nonlinear metasurfaces for the generation of quantum photon-pair states
Nonlinear metasurfaces for the generation of quantum photon-pair states Open
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Experimental data: We use a .csv file format for all data sets. File names follow the figure numbers in the main text, and each figure is associated with separate x-axis and y-axis files. Matlab .fig and .svg files are also included for al…
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Experimental data: We use a .csv file format for all data sets. File names follow the figure numbers in the main text, and each figure is associated with separate x-axis and y-axis files. Matlab .fig and .svg files are also included for al…
View article: Tunable directional photon scattering from a pair of superconducting qubits
Tunable directional photon scattering from a pair of superconducting qubits Open
The ability to control the direction of scattered light is crucial to provide flexibility and scalability for a wide range of on-chip applications, such as integrated photonics, quantum information processing, and nonlinear optics. Tunable…
View article: Tunable directional photon scattering from a pair of superconducting qubits
Tunable directional photon scattering from a pair of superconducting qubits Open
This dataset comprises all data shown in the figures of the submitted article "Tunable directional photon scattering from a pair of superconducting qubits" at arXiv:2205.03293. Additional raw data are available from the corresponding autho…
View article: Tunable directional photon scattering from a pair of superconducting qubits
Tunable directional photon scattering from a pair of superconducting qubits Open
This dataset comprises all data shown in the figures of the submitted article "Tunable directional photon scattering from a pair of superconducting qubits" at arXiv:2205.03293. Additional raw data are available from the corresponding autho…
View article: Bound state of distant photons in waveguide quantum electrodynamics
Bound state of distant photons in waveguide quantum electrodynamics Open
Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. Here we predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Paradoxi…
View article: Long persistent anticorrelations in few-qubit arrays
Long persistent anticorrelations in few-qubit arrays Open
We consider theoretically the mechanisms to realize antibunching between the photons scattered on the array of two-level atoms in a general electromagnetic environment. Our goal is the antibunching that persists for the times much longer t…
View article: Two-photon pulse scattering spectroscopy for arrays of two-level atoms, coupled to the waveguide
Two-photon pulse scattering spectroscopy for arrays of two-level atoms, coupled to the waveguide Open
We have theoretically studied the scattering of two-photon pulses from a spatially-separated array of two-level atoms coupled to the waveguide. A general analytical expression for the scattered pulse has been obtained. The contributions of…
View article: Resonant Parametric Photon Generation in Waveguide-coupled Quantum Emitter Arrays
Resonant Parametric Photon Generation in Waveguide-coupled Quantum Emitter Arrays Open
We have developed a theory of parametric photon generation in the waveguides coupled to arrays of quantum emitters with temporally modulated resonance frequencies. Such generation can be interpreted as a dynamical Casimir effect. We demons…
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Vortices are a hallmark of topologically nontrivial dynamics in nonlinear physics and arise in a huge variety of systems, from space and atmosphere to condensed matter and quantum gases. In optics, vortices manifest as phase twists of the …
View article: Slowing down light in a qubit metamaterial
Slowing down light in a qubit metamaterial Open
The rapid progress in quantum information processing leads to a rising demand for devices to control the propagation of electromagnetic wave pulses and to ultimately realize universal and efficient quantum memory. While in recent years, si…
View article: Topologically bound states, non-Hermitian skin effect and flat bands, induced by two-particle interaction
Topologically bound states, non-Hermitian skin effect and flat bands, induced by two-particle interaction Open
We study theoretically quantum states of two repelling spinless particles in a one-dimensional tight-binding model with simple periodic lattice and open boundary conditions. We demonstrate, that when the particles are not identical, their …
View article: Chirality-driven delocalization in disordered waveguide-coupled quantum arrays
Chirality-driven delocalization in disordered waveguide-coupled quantum arrays Open
We study theoretically the competition between directional asymmetric coupling and disorder in a one-dimensional array of quantum emitters chirally coupled through a waveguide mode. Our calculation reveals a highly nontrivial phase diagram…
View article: Tunable directional photon scattering from a pair of superconducting qubits
Tunable directional photon scattering from a pair of superconducting qubits Open
The ability to control the direction of scattered light in integrated devices is crucial to provide the flexibility and scalability for a wide range of on-chip applications, such as integrated photonics, quantum information processing and …
View article: Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces
Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces Open
We reveal that strongly enhanced generation of photon pairs with narrow frequency spectra and sharp angular correlations can be realised through spontaneous parametric down-conversion in metasurfaces. This is facilitated by creating meta-g…
View article: Frequency combs with parity-protected cross-correlations from dynamically modulated qubit arrays
Frequency combs with parity-protected cross-correlations from dynamically modulated qubit arrays Open
We develop a general theoretical framework to dynamically engineer quantum correlations in the frequency-comb emission from an array of superconducting qubits in a waveguide, rigorously accounting for the temporal modulation of the qubit r…