TY  - JOUR
AU  - Pejić, Milan
AU  - Pržulj, Željko
AU  - Čevizović, Dalibor
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
AU  - Ivić, Zoran
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10524
AB  - We study quantum features of electromagnetic radiation propagating in a one-dimensional superconducting quantum metamaterial composed of an infinite chain of charge qubits placed within two stripe massive superconducting resonators. The quantum-mechanical model is derived assuming weak fields and that, at low temperatures, each qubit is either unoccupied or occupied by a single Cooper pair. We demonstrate the emergence of two bands of single-photon qubit bound states with the energies lying outside the photon continuum—one is above and the second slightly below the linear photon band. The higher energy band varies slowly with the qubit-photon center of mass quasimomentum. It becomes practically flat provided that the electromagnetic energy is far below the Josephson energy when the latter is small compared to the charging energy. The dispersion of the lower band is practically identical to that of free photons. The emergence of bound states may cause radiation trapping indicating possible applicability for the control of photon transport in superconducting qubit-based artificial media.
T2  - Physical Review B
T1  - Qubit-photon bound states in superconducting metamaterials
VL  - 105
IS  - 23
SP  - 235439
DO  - 10.1103/PhysRevB.105.235439
ER  - 

@article{
author = "Pejić, Milan and Pržulj, Željko and Čevizović, Dalibor and Lazarides, Nikos and Tsironis, Giorgos P. and Ivić, Zoran",
year = "2022",
abstract = "We study quantum features of electromagnetic radiation propagating in a one-dimensional superconducting quantum metamaterial composed of an infinite chain of charge qubits placed within two stripe massive superconducting resonators. The quantum-mechanical model is derived assuming weak fields and that, at low temperatures, each qubit is either unoccupied or occupied by a single Cooper pair. We demonstrate the emergence of two bands of single-photon qubit bound states with the energies lying outside the photon continuum—one is above and the second slightly below the linear photon band. The higher energy band varies slowly with the qubit-photon center of mass quasimomentum. It becomes practically flat provided that the electromagnetic energy is far below the Josephson energy when the latter is small compared to the charging energy. The dispersion of the lower band is practically identical to that of free photons. The emergence of bound states may cause radiation trapping indicating possible applicability for the control of photon transport in superconducting qubit-based artificial media.",
journal = "Physical Review B",
title = "Qubit-photon bound states in superconducting metamaterials",
volume = "105",
number = "23",
pages = "235439",
doi = "10.1103/PhysRevB.105.235439"
}

Pejić, M., Pržulj, Ž., Čevizović, D., Lazarides, N., Tsironis, G. P.,& Ivić, Z.. (2022). Qubit-photon bound states in superconducting metamaterials. in Physical Review B, 105(23), 235439.
https://doi.org/10.1103/PhysRevB.105.235439

Pejić M, Pržulj Ž, Čevizović D, Lazarides N, Tsironis GP, Ivić Z. Qubit-photon bound states in superconducting metamaterials. in Physical Review B. 2022;105(23):235439.
doi:10.1103/PhysRevB.105.235439 .

Pejić, Milan, Pržulj, Željko, Čevizović, Dalibor, Lazarides, Nikos, Tsironis, Giorgos P., Ivić, Zoran, "Qubit-photon bound states in superconducting metamaterials" in Physical Review B, 105, no. 23 (2022):235439,
https://doi.org/10.1103/PhysRevB.105.235439 . .

TY  - JOUR
AU  - Ivić, Zoran
AU  - Čevizović, Dalibor
AU  - Pržulj, Željko
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8920
AB  - We focus on self-induced transparency (SIT) in the propagation of a pulse in a dispersive medium. The latter can be an ordinary optical medium or, more interestingly, a quantum metamaterial. In both cases we consider a sequence of two level atoms each with a characteristic resonant frequency ω0. The propagation features are controlled by the ratio of the pulse frequency ω over the dipole resonant frequency, i.e. on the quantity X=ω/ω0. We consider analytically two pulse limits, viz. the sharp line limit as well as the inhomogeneouly broadened case. In the first case we find that for pulse frequencies larger than ω0, i.e. for X>1 the SIT pulse may be fully stopped through absorption by the medium provided its time width exceeds a certain critical value. In the latter case of inhomogeneously broadened medium we find no such frequency restrictions provided the pulse is wide enough. As a result an SIT pulse can be arbitrarily arrested by the absorbing medium. This dispersion-induced pulse stopping is a manifestation of the quantum nature of the medium and of possible use in metamaterial applications. © 2020 Elsevier Ltd
T2  - Chaos, Solitons and Fractals
T1  - Dispersive properties of self–induced transparency in two–level media
VL  - 143
SP  - 110611
DO  - 10.1016/j.chaos.2020.110611
ER  - 

@article{
author = "Ivić, Zoran and Čevizović, Dalibor and Pržulj, Željko and Lazarides, Nikos and Tsironis, Giorgos P.",
year = "2021",
abstract = "We focus on self-induced transparency (SIT) in the propagation of a pulse in a dispersive medium. The latter can be an ordinary optical medium or, more interestingly, a quantum metamaterial. In both cases we consider a sequence of two level atoms each with a characteristic resonant frequency ω0. The propagation features are controlled by the ratio of the pulse frequency ω over the dipole resonant frequency, i.e. on the quantity X=ω/ω0. We consider analytically two pulse limits, viz. the sharp line limit as well as the inhomogeneouly broadened case. In the first case we find that for pulse frequencies larger than ω0, i.e. for X>1 the SIT pulse may be fully stopped through absorption by the medium provided its time width exceeds a certain critical value. In the latter case of inhomogeneously broadened medium we find no such frequency restrictions provided the pulse is wide enough. As a result an SIT pulse can be arbitrarily arrested by the absorbing medium. This dispersion-induced pulse stopping is a manifestation of the quantum nature of the medium and of possible use in metamaterial applications. © 2020 Elsevier Ltd",
journal = "Chaos, Solitons and Fractals",
title = "Dispersive properties of self–induced transparency in two–level media",
volume = "143",
pages = "110611",
doi = "10.1016/j.chaos.2020.110611"
}

Ivić, Z., Čevizović, D., Pržulj, Ž., Lazarides, N.,& Tsironis, G. P.. (2021). Dispersive properties of self–induced transparency in two–level media. in Chaos, Solitons and Fractals, 143, 110611.
https://doi.org/10.1016/j.chaos.2020.110611

Ivić Z, Čevizović D, Pržulj Ž, Lazarides N, Tsironis GP. Dispersive properties of self–induced transparency in two–level media. in Chaos, Solitons and Fractals. 2021;143:110611.
doi:10.1016/j.chaos.2020.110611 .

Ivić, Zoran, Čevizović, Dalibor, Pržulj, Željko, Lazarides, Nikos, Tsironis, Giorgos P., "Dispersive properties of self–induced transparency in two–level media" in Chaos, Solitons and Fractals, 143 (2021):110611,
https://doi.org/10.1016/j.chaos.2020.110611 . .

TY  - JOUR
AU  - Ivić, Zoran
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S2590054419300028
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8072
AB  - We introduce a quantum superconducting metamaterial design constituted of flux qubits that operate as artificial atoms and analyze the dynamics of an injected electromagnetic pulse in the system. Qubit-photon interaction affects dramatically the nonlinear photon pulse propagation. We find analytically that the well known atomic phenomenon of self induced transparency may occur in this metamaterial as well and may lead to significant control over the optical pulse propagating properties. Specifically, the pulse may be slowed down substantially or even be stopped. These pulse properties depend crucially on the inhomogeneous broadening of the levels of the artificial atoms. © 2019
T2  - Chaos, Solitons and Fractals: X
T1  - Self-induced transparency in a flux-qubit chain
VL  - 1
SP  - 100003
DO  - 10.1016/j.csfx.2019.100003
ER  - 

@article{
author = "Ivić, Zoran and Lazarides, Nikos and Tsironis, Giorgos P.",
year = "2019",
abstract = "We introduce a quantum superconducting metamaterial design constituted of flux qubits that operate as artificial atoms and analyze the dynamics of an injected electromagnetic pulse in the system. Qubit-photon interaction affects dramatically the nonlinear photon pulse propagation. We find analytically that the well known atomic phenomenon of self induced transparency may occur in this metamaterial as well and may lead to significant control over the optical pulse propagating properties. Specifically, the pulse may be slowed down substantially or even be stopped. These pulse properties depend crucially on the inhomogeneous broadening of the levels of the artificial atoms. © 2019",
journal = "Chaos, Solitons and Fractals: X",
title = "Self-induced transparency in a flux-qubit chain",
volume = "1",
pages = "100003",
doi = "10.1016/j.csfx.2019.100003"
}

Ivić, Z., Lazarides, N.,& Tsironis, G. P.. (2019). Self-induced transparency in a flux-qubit chain. in Chaos, Solitons and Fractals: X, 1, 100003.
https://doi.org/10.1016/j.csfx.2019.100003

Ivić Z, Lazarides N, Tsironis GP. Self-induced transparency in a flux-qubit chain. in Chaos, Solitons and Fractals: X. 2019;1:100003.
doi:10.1016/j.csfx.2019.100003 .

Ivić, Zoran, Lazarides, Nikos, Tsironis, Giorgos P., "Self-induced transparency in a flux-qubit chain" in Chaos, Solitons and Fractals: X, 1 (2019):100003,
https://doi.org/10.1016/j.csfx.2019.100003 . .

TY  - JOUR
AU  - Ivić, Zoran
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1167
AB  - Quantum bits (qubits) are at the heart of quantum information processing schemes. Currently, solid-state qubits, and in particular the superconducting ones, seem to satisfy the requirements for being the building blocks of viable quantum computers, since they exhibit relatively long coherence times, extremely low dissipation, and scalability. The possibility of achieving quantum coherence in macroscopic circuits comprising Josephson junctions, envisioned by Legett in the 1980s, was demonstrated for the first time in a charge qubit; since then, the exploitation of macroscopic quantum effects in low-capacitance Josephson junction circuits allowed for the realization of several kinds of superconducting qubits. Furthermore, coupling between qubits has been successfully achieved that was followed by the construction of multiple-qubit logic gates and the implementation of several algorithms. Here it is demonstrated that induced qubit lattice coherence as well as two remarkable quantum coherent optical phenomena, i.e., self-induced transparency and Dicke-type superradiance, may occur during light-pulse propagation in quantum metamaterials comprising superconducting charge qubits. The generated qubit lattice pulse forms a compound quantum breather that propagates in synchrony with the electromagnetic pulse. The experimental confirmation of such effects in superconducting quantum metamaterials may open a new pathway to potentially powerful quantum computing.
T2  - Scientific Reports
T1  - Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials
VL  - 6
DO  - 10.1038/srep29374
ER  - 

@article{
author = "Ivić, Zoran and Lazarides, Nikos and Tsironis, Giorgos P.",
year = "2016",
abstract = "Quantum bits (qubits) are at the heart of quantum information processing schemes. Currently, solid-state qubits, and in particular the superconducting ones, seem to satisfy the requirements for being the building blocks of viable quantum computers, since they exhibit relatively long coherence times, extremely low dissipation, and scalability. The possibility of achieving quantum coherence in macroscopic circuits comprising Josephson junctions, envisioned by Legett in the 1980s, was demonstrated for the first time in a charge qubit; since then, the exploitation of macroscopic quantum effects in low-capacitance Josephson junction circuits allowed for the realization of several kinds of superconducting qubits. Furthermore, coupling between qubits has been successfully achieved that was followed by the construction of multiple-qubit logic gates and the implementation of several algorithms. Here it is demonstrated that induced qubit lattice coherence as well as two remarkable quantum coherent optical phenomena, i.e., self-induced transparency and Dicke-type superradiance, may occur during light-pulse propagation in quantum metamaterials comprising superconducting charge qubits. The generated qubit lattice pulse forms a compound quantum breather that propagates in synchrony with the electromagnetic pulse. The experimental confirmation of such effects in superconducting quantum metamaterials may open a new pathway to potentially powerful quantum computing.",
journal = "Scientific Reports",
title = "Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials",
volume = "6",
doi = "10.1038/srep29374"
}

Ivić, Z., Lazarides, N.,& Tsironis, G. P.. (2016). Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials. in Scientific Reports, 6.
https://doi.org/10.1038/srep29374

Ivić Z, Lazarides N, Tsironis GP. Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials. in Scientific Reports. 2016;6.
doi:10.1038/srep29374 .

Ivić, Zoran, Lazarides, Nikos, Tsironis, Giorgos P., "Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials" in Scientific Reports, 6 (2016),
https://doi.org/10.1038/srep29374 . .

TY  - CONF
AU  - Lazarides, Nikos
AU  - Ivić, Zoran
AU  - Tsironis, Giorgos P.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7146
AB  - Superconducting quantum bits (qubits) are at the heart of quantum information processing schemes since they satisfy the requirements for being the building blocks of viable quantum computers. Here it is shown that quantum coherence, in the form of population inversion pulses, is induced by self-induced transparent electromagnetic pulses propagating in a quantum metamaterial comprising superconducting charge qubits. The experimental confirmation of that effect may open a new pathway to potentially powerful quantum computing.
T1  - Quantum coherence in a qubit chain induced by electromagnetic pulses
SP  - 202
EP  - 204
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7146
ER  - 

@conference{
author = "Lazarides, Nikos and Ivić, Zoran and Tsironis, Giorgos P.",
year = "2016",
abstract = "Superconducting quantum bits (qubits) are at the heart of quantum information processing schemes since they satisfy the requirements for being the building blocks of viable quantum computers. Here it is shown that quantum coherence, in the form of population inversion pulses, is induced by self-induced transparent electromagnetic pulses propagating in a quantum metamaterial comprising superconducting charge qubits. The experimental confirmation of that effect may open a new pathway to potentially powerful quantum computing.",
title = "Quantum coherence in a qubit chain induced by electromagnetic pulses",
pages = "202-204",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7146"
}

Lazarides, N., Ivić, Z.,& Tsironis, G. P.. (2016). Quantum coherence in a qubit chain induced by electromagnetic pulses. , 202-204.
https://hdl.handle.net/21.15107/rcub_vinar_7146

Lazarides N, Ivić Z, Tsironis GP. Quantum coherence in a qubit chain induced by electromagnetic pulses. 2016;:202-204.
https://hdl.handle.net/21.15107/rcub_vinar_7146 .

Lazarides, Nikos, Ivić, Zoran, Tsironis, Giorgos P., "Quantum coherence in a qubit chain induced by electromagnetic pulses" (2016):202-204,
https://hdl.handle.net/21.15107/rcub_vinar_7146 .

TY  - JOUR
AU  - Maluckov, Aleksandra
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
AU  - Hadžievski, Ljupčo
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5490
AB  - Spatiotemporal complexity is induced in a two dimensional nonlinear disordered lattice through the modulational instability of an initially weakly perturbed excitation. In the course of evolution we observe the formation of transient as well as persistent localized structures, some of which have extreme magnitude. We analyze the statistics of occurrence of these extreme collective events and find that the appearance of transient extreme events is more likely in the weakly nonlinear regime. We observe a transition in the extreme events recurrence time probability from exponential, in the nonlinearity dominated regime, to power law for the disordered one. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Physica. D: Nonlinear Phenomena
T1  - Extreme events in two-dimensional disordered nonlinear lattices
VL  - 252
SP  - 59
EP  - 64
DO  - 10.1016/j.physd.2013.03.001
ER  - 

@article{
author = "Maluckov, Aleksandra and Lazarides, Nikos and Tsironis, Giorgos P. and Hadžievski, Ljupčo",
year = "2013",
abstract = "Spatiotemporal complexity is induced in a two dimensional nonlinear disordered lattice through the modulational instability of an initially weakly perturbed excitation. In the course of evolution we observe the formation of transient as well as persistent localized structures, some of which have extreme magnitude. We analyze the statistics of occurrence of these extreme collective events and find that the appearance of transient extreme events is more likely in the weakly nonlinear regime. We observe a transition in the extreme events recurrence time probability from exponential, in the nonlinearity dominated regime, to power law for the disordered one. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Physica. D: Nonlinear Phenomena",
title = "Extreme events in two-dimensional disordered nonlinear lattices",
volume = "252",
pages = "59-64",
doi = "10.1016/j.physd.2013.03.001"
}

Maluckov, A., Lazarides, N., Tsironis, G. P.,& Hadžievski, L.. (2013). Extreme events in two-dimensional disordered nonlinear lattices. in Physica. D: Nonlinear Phenomena, 252, 59-64.
https://doi.org/10.1016/j.physd.2013.03.001

Maluckov A, Lazarides N, Tsironis GP, Hadžievski L. Extreme events in two-dimensional disordered nonlinear lattices. in Physica. D: Nonlinear Phenomena. 2013;252:59-64.
doi:10.1016/j.physd.2013.03.001 .

Maluckov, Aleksandra, Lazarides, Nikos, Tsironis, Giorgos P., Hadžievski, Ljupčo, "Extreme events in two-dimensional disordered nonlinear lattices" in Physica. D: Nonlinear Phenomena, 252 (2013):59-64,
https://doi.org/10.1016/j.physd.2013.03.001 . .

TY  - JOUR
AU  - Maluckov, Aleksandra
AU  - Hadžievski, Ljupčo
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3643
AB  - We perform statistical analysis on discrete nonlinear waves generated through modulational instability in the context of the Salerno model that interpolates between the intregable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.
T2  - Physical Review E
T1  - Extreme events in discrete nonlinear lattices
VL  - 79
IS  - 2
DO  - 10.1103/PhysRevE.79.025601
ER  - 

@article{
author = "Maluckov, Aleksandra and Hadžievski, Ljupčo and Lazarides, Nikos and Tsironis, Giorgos P.",
year = "2009",
abstract = "We perform statistical analysis on discrete nonlinear waves generated through modulational instability in the context of the Salerno model that interpolates between the intregable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.",
journal = "Physical Review E",
title = "Extreme events in discrete nonlinear lattices",
volume = "79",
number = "2",
doi = "10.1103/PhysRevE.79.025601"
}

Maluckov, A., Hadžievski, L., Lazarides, N.,& Tsironis, G. P.. (2009). Extreme events in discrete nonlinear lattices. in Physical Review E, 79(2).
https://doi.org/10.1103/PhysRevE.79.025601

Maluckov A, Hadžievski L, Lazarides N, Tsironis GP. Extreme events in discrete nonlinear lattices. in Physical Review E. 2009;79(2).
doi:10.1103/PhysRevE.79.025601 .

Maluckov, Aleksandra, Hadžievski, Ljupčo, Lazarides, Nikos, Tsironis, Giorgos P., "Extreme events in discrete nonlinear lattices" in Physical Review E, 79, no. 2 (2009),
https://doi.org/10.1103/PhysRevE.79.025601 . .

TY  - JOUR
AU  - Maluckov, Aleksandra
AU  - Hadžievski, Ljupčo
AU  - Lazarides, Nikos
AU  - Tsironis, Giorgos P.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3438
AB  - The left-handed properties of metamaterials with saturable nonlinearity are analyzed with respect to their electromagnetic response as a function of externally varying parameters. We demonstrate that the response of the medium is strongly affected by the saturation of the nonlinear effects. The last can be exploited to modulate the amplitude or tune the frequency of the response. Moreover, the existence of bistability regions in large parts of the external parameter space allows for switching between different magnetization states, with either positive or negative response. The stability issue of multiple possible states is addressed through modulational instability analysis of plane wave envelopes in each of those states.
T2  - Physical Review E
T1  - Left-handed metamaterials with saturable nonlinearity
VL  - 77
IS  - 4
DO  - 10.1103/PhysRevE.77.046607
ER  - 

@article{
author = "Maluckov, Aleksandra and Hadžievski, Ljupčo and Lazarides, Nikos and Tsironis, Giorgos P.",
year = "2008",
abstract = "The left-handed properties of metamaterials with saturable nonlinearity are analyzed with respect to their electromagnetic response as a function of externally varying parameters. We demonstrate that the response of the medium is strongly affected by the saturation of the nonlinear effects. The last can be exploited to modulate the amplitude or tune the frequency of the response. Moreover, the existence of bistability regions in large parts of the external parameter space allows for switching between different magnetization states, with either positive or negative response. The stability issue of multiple possible states is addressed through modulational instability analysis of plane wave envelopes in each of those states.",
journal = "Physical Review E",
title = "Left-handed metamaterials with saturable nonlinearity",
volume = "77",
number = "4",
doi = "10.1103/PhysRevE.77.046607"
}

Maluckov, A., Hadžievski, L., Lazarides, N.,& Tsironis, G. P.. (2008). Left-handed metamaterials with saturable nonlinearity. in Physical Review E, 77(4).
https://doi.org/10.1103/PhysRevE.77.046607

Maluckov A, Hadžievski L, Lazarides N, Tsironis GP. Left-handed metamaterials with saturable nonlinearity. in Physical Review E. 2008;77(4).
doi:10.1103/PhysRevE.77.046607 .

Maluckov, Aleksandra, Hadžievski, Ljupčo, Lazarides, Nikos, Tsironis, Giorgos P., "Left-handed metamaterials with saturable nonlinearity" in Physical Review E, 77, no. 4 (2008),
https://doi.org/10.1103/PhysRevE.77.046607 . .