A5074153863- Quantum Information and Cryptography
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
- Quantum optics and atomic interactions
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Plasmonic and Surface Plasmon Research
- 2D Materials and Applications
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- Neural Networks and Reservoir Computing
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Nonlinear Photonic Systems
- Laser-Matter Interactions and Applications
- Quantum Mechanics and Applications
- Quantum Chromodynamics and Particle Interactions
- Thermal Radiation and Cooling Technologies
- Advanced Sensor and Energy Harvesting Materials
- Spectroscopy and Quantum Chemical Studies
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Thermodynamics and Statistical Mechanics
- Gold and Silver Nanoparticles Synthesis and Applications
Istituto Nazionale di Fisica Nucleare
2025
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2023-2024
Institute of Photonic Sciences
2019-2024
Institute of Science and Technology
2022
Barcelona Institute for Science and Technology
2022
Shanghai Institute for Science of Science
2022
TU Wien
2016-2019
Vienna Center for Quantum Science and Technology
2016-2019
We discuss the properties of atom-photon bound states in waveguide QED systems consisting single or multiple atoms coupled strongly to a finite-bandwidth photonic channel. Such are formed by an atom and localized excitation represent continuum analog familiar dressed single-mode cavity QED. Here we present detailed analysis linear nonlinear spectral features associated with single- multiphoton show how formation affects waveguide-mediated dipole-dipole interactions between separated atoms....
Excitation of a bound state in the continuum (BIC) through scattering is problematic since it by definition uncoupled. Here, we consider type dressed BIC and show that can be excited nonlinear system multiphoton delayed quantum feedback. The semi-infinite waveguide with linear dispersion coupled to qubit, which single-photon, known exist. We this populated via non-Markovian regime, where photon delay time (due qubit-mirror distance) comparable qubit's decay. A similar process excites...
We theoretically study the few- and many-body dynamics of photons in chiral waveguides. In particular, we examine pulse propagation through an ensemble N two-level systems chirally coupled to a waveguide. show that system supports correlated multiphoton bound states, which have well-defined photon number n propagate with group delay scaling as 1/n2. This has interesting consequence that, during propagation, incident coherent-state breaks up into different bound-state components can become...
Engineering the electromagnetic environment of a quantum emitter gives rise to plethora exotic light-matter interactions. In particular, photonic lattices can seed long-lived atom-photon bound states inside band gaps. Here we report on concept and implementation novel microwave architecture consisting an array compact, high-impedance superconducting resonators forming 1 GHz-wide pass band, in which have embedded two frequency-tuneable artificial atoms. We study atom-field interaction access...
Photon-mediated interaction between quantum emitters in engineered photonic baths is an emerging area of optics. At the same time, non-Hermitian (NH) physics currently thriving, spurred by exciting possibility to access new systems ruled non-trivial NH Hamiltonians—in particular, lattices—which can challenge longstanding tenets such as Bloch theory bands. Here, we combine these two fields and study exotic mediated modes a lossy lattice described Hamiltonian. We show paradigmatic case that...
We present a quantum simulation strategy for (1+1)-dimensional SU(2) non-Abelian lattice gauge theory with dynamical matter, hardcore-gluon Hamiltonian Yang-Mills, tailored to six-level trapped-ion-qudit processor, as recently experimentally realized [Nat. Phys. 18, 1053 (2022)]. employ qudit encoding fulfilling invariance, an Gauss’s law. discuss the experimental feasibility of generalized Mølmer-Sørensen gates used efficiently simulate dynamics. illustrate how shallow circuit these...
Quantum many-body scarring (QMBS) is an intriguing mechanism of weak ergodicity breaking that has recently spurred significant attention. Particularly prominent in Abelian lattice gauge theories (LGTs), open question whether QMBS nontrivially arises non-Abelian LGTs. Here, we present evidence robust a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>SU</a:mi><a:mo>(</a:mo><a:mn>2</a:mn><a:mo>)</a:mo></a:mrow></a:math> LGT with dynamical matter. Starting product states...
We analyze a multiqubit circuit QED system in the regime where qubit-photon coupling dominates over system's bare energy scales. Under such conditions manifold of low-energy states with high degree entanglement emerges. Here we describe time-dependent protocol for extracting these quantum correlations and converting them into well-defined multipartite entangled noninteracting qubits. Based on combination various ultrastrong-coupling effects, can be operated fast robust manner, while still...
One-dimensional confinement in waveguide quantum electrodynamics (QED) plays a crucial role to enhance light-matter interactions and induce strong nonlinear optical response. In two or higher-dimensional settings, this response is reduced since photons can be emitted within larger phase space, opening the question whether photon-photon interaction still achieved. study, we positively answer for case of 2D square array atoms coupled light confined into two-dimensional waveguide. More...
We analyze the coupling of atoms or atom-like emitters to nanophotonic waveguides in presence propagating acoustic waves. Specifically, we show that strong index modulations induced by such waves can drastically modify effective photonic density states and thereby influence strength, directionality, as well overall characteristics photon emission absorption processes. These effects enable a complete dynamical control light-matter interactions waveguide structures, which even two dimensional...
We describe the coupling of moving atoms to a one-dimensional photonic waveguide in regime where atomic velocities are comparable effective speed light. Such conditions could be achieved, for example, crystals or coupled resonator arrays, maximal group velocity is significantly reduced compared free space. In this case, interplay between velocity-induced directionality and emergence new divergencies density states gives rise range novel phenomena nonperturbative effects emission photons...
Solitons are known to occur in the context of atom-light interaction via well-known semiclassical phenomenon self-induced transparency (SIT). Separately, regime where both light and atoms fully treated quantum mechanically, few-photon bound states be a ubiquitous that arises different systems such as coupled chiral or bidirectional waveguides, Rydberg atomic media. In specific case two-level waveguide, recent analysis based on Bethe ansatz has established SIT emerges from realm superposition...
Controlling excitons at the nanoscale in semiconductor materials represents a formidable challenge quantum photonics and optoelectronics fields. Monolayers of transition metal dichalcogenides (TMDs) offer inherent 2D confinement possess significant exciton binding energies, making them promising candidates for achieving electric-field-based without dissociation. Exploiting valley degree freedom associated with these confined states further broadens prospects engineering. Here, we show...
Graphene has emerged as a promising platform to bring nonlinear quantum optics the nanoscale, where large intrinsic optical nonlinearity enables long-lived and actively tunable plasmon polaritons strongly interact. Here we theoretically study collision between two counter-propagating plasmons in graphene nanoribbon, transversal subwavelength confinement endows propagating with %large effective masses flat band dispersion that enhances their interaction. This scenario presents interesting...
We consider the spontaneous emission of a two-level quantum emitter, such as an atom or dot, in modulated time-dependent environment with photonic band gap. An example is dynamical crystal any other bandgap whose properties are time, effective mass approximation. After introducing our model crystal, we show that it allows new possibilities to control and tailor physical features emitted radiation, specifically its frequency spectrum. In weak coupling limit adiabatic case, obtain spectrum...
We present a quantum simulation strategy for (1+1)D SU(2) non-abelian lattice gauge theory, hardcore-gluon Hamiltonian Yang-Mills, tailored to six-level trapped-ion qudit processor, as recently experimentally realized. employ encoding fulfilling invariance, an Gauss' law. discuss the experimental feasibility of generalized M{\o}lmer-S{\o}rensen gates used efficiently simulate dynamics. illustrate how shallow circuit with these resources is sufficient implement scalable digital model. also...
We introduce a picture to describe and intrepret waveguide-QED problems in the non-Markovian regime of long photonic retardation times resulting delayed coherent feedback. The framework is based on an intuitive spatial decomposition waveguide into blocks. Among these, block directly coupled atoms embodies effective lossy multimode cavity leaking rest waveguide, turn embodying white-noise bath. dynamics can be approximated by retaining only finite number modes that yet eventually grows with...
Quantum many-body scarring (QMBS) is an intriguing mechanism of ergodicity breaking that has recently spurred significant attention. Particularly prominent in Abelian lattice gauge theories (LGTs), open question whether QMBS nontrivially arises non-Abelian LGTs. Here, we present evidence robust a SU(2) LGT with dynamical matter. Starting product states require little experimental overhead, show for certain quenches, facilitated through meson and baryon-antibaryon excitations, highlighting...
Engineering the electromagnetic environment of a quantum emitter gives rise to plethora exotic light-matter interactions. In particular, photonic lattices can seed long-lived atom-photon bound states inside band gaps. Here we report on concept and implementation novel microwave architecture consisting an array compact, high-impedance superconducting resonators forming 1 GHz-wide pass band, in which have embedded two frequency-tuneable artificial atoms. We study atom-field interaction access...