A5011957492- Quantum optics and atomic interactions
- Semiconductor Quantum Structures and Devices
- Strong Light-Matter Interactions
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Maritime Ports and Logistics
- Molecular Junctions and Nanostructures
- Urban and Freight Transport Logistics
- Advanced Manufacturing and Logistics Optimization
- Spectroscopy Techniques in Biomedical and Chemical Research
- Smart Parking Systems Research
- Indoor and Outdoor Localization Technologies
- Orbital Angular Momentum in Optics
- Optical and Acousto-Optic Technologies
- Plant Physiology and Cultivation Studies
- Semiconductor Lasers and Optical Devices
- Nonlinear Waves and Solitons
- Laser-Matter Interactions and Applications
- Random lasers and scattering media
- Transportation and Mobility Innovations
Paderborn University
2020-2024
Universität Hamburg
2022-2024
Hamburg University of Technology
2022-2024
Abstract Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the ensemble dynamics. Control echo emission time mandatory applications. Here, we propose concept reach this goal. two-pulse sequence, apply an...
Multidimensional coherent spectroscopy (MDCS) is used to separate and incoherent many-body contributions the population-time dynamics in a GaAs-based semiconductor microcavity encapsulating single InGaAs quantum well. In three-pulse four-wave-mixing scheme, second delay time population that MDCS probes excited-state coherences dynamics. Nonlinear optical interactions can mix these contributions, which are isolated here for lower- upper-exciton-polariton through self- mutual-interaction...
The interaction of matter with quantum light leads to phenomena which cannot be explained by semiclassical approaches. Of particular interest are states broad photon number distributions allow processes high-order Fock states. Here, we analyze a Jaynes-Cummings-type model three electronic levels is excited light. As consider coherent and squeezed In our simulations include several loss mechanisms, namely, dephasing, cavity, radiative losses relevant in real systems. We demonstrate that one...
We study Rabi rotations arising in intensity-dependent photon echoes from an ensemble of self-assembled InGaAs quantum dots. To achieve a uniform distribution intensities within the excited ensemble, we introduce flattop intensity profiles picosecond laser pulses. This allows us to overcome damping imposed by spatial inhomogeneity frequencies Gaussian profile. Using echo polarimetry, distinguish between coherent optical responses exciton and trion ensembles. Here, demonstrate that...
The dynamics of semiconductor quantum wires and wells that are coupled to a single-mode field analyzed. Within two-band tight-binding model the Coulomb interaction between electrons holes is included on microscopic basis light-matter quantized. system described by equations motion for relevant set expectation values electronic-photonic system. Starting from initial condition single photon occupying mode, we study mean number. To analyze effects arising many-body interaction, use an exact...
The time-dependent one-dimensional nonlinear Schr\"odinger equation (NLSE) is solved numerically by a hybrid pseudospectral-variational quantum algorithm that connects pseudospectral step for the Hamiltonian term with variational term. treated as an integrating factor forward and backward Fourier transformations, which are here carried out classically. This split allows us to avoid higher-order time integration schemes, apply first-order explicit stepping remaining NLSE in block, thus...
We theoretically study quantum-optical properties of one- and two-dimensional semiconductor nanostructures, where the electronic band structure is described by a two-band tight-binding model. Since focus our work on analyzing effects systems with continuous structure, many-body processes like electron-electron electron-phonon interactions are neglected. The interband excitations fully incorporated Jaynes-Cummings-type exciting quantum light can be state arbitrary photon statistics. For...
The interaction between quantum light and matter is being intensively studied for systems that are enclosed in high-$Q$ cavities which strongly enhance the light-matter coupling. However, many applications, with lower $Q$-factors preferred due to increased spectral width of cavity mode. Here, we investigate represented by a $\Lambda$-type three-level system lossy cavities, assuming losses dominant loss mechanism. We demonstrate lead non-trivial steady states electronic occupations can be...
Ultrafast exciton-polariton dynamics are investigated using optical multidimensional coherent spectroscopy. A Bloch simulation including Pauli blocking and the Coulomb interaction between excitons is found to give good agreement with measured spectra.
The nonlinear optical response of an ensemble semiconductor quantum dots is analyzed by wave-mixing processes, where we focus on four-wave mixing with two incident pulses. Wave-mixing experiments are often described semiclassical models, the light modeled classically and material mechanically. Here, however, use a fully quantized model, given state light. Quantum involves more degrees freedom than classical as e.g., its photon statistics correlations, which promising resource for devices,...
Interaction of light with atomic-like solid-state systems, such as semiconductor quantum dots (QDs) discrete energy levels, is key for the implementation high-speed gates and information processing in semiconductor-based devices. Of particular interest are degenerate multiwave-mixing processes under resonant conditions that establish strong light–matter interactions beyond limits perturbative nonlinear optics. Here, we exploit a multitude picosecond optical pulses to manipulate unitary...
The prediction of photon echoes is a crucial technique for gaining an understanding optical quantum systems. However, it requires large number simulations with varying parameters and/or input pulses, which renders numerical studies expensive. This article investigates how we can use data-driven surrogate models based on the Koopman operator to accelerate this process while maintaining accuracy over time steps. To end, employ bilinear model using extended dynamic mode decomposition and...
Container transports within ports are characterized by mostly manual trucks and many handling operations in relatively small areas. Accordingly, they incur a disproportionately large cost maritime transport chains. One way to reduce these costs is use automated port-internal system. Such systems have only been used on terminals, but not whole ports. Thus, it important determine the design parameters of such systems. discrete event simulation particularly suitable for investigating planned...
Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the ensemble dynamics. Control echo emission time mandatory applications. Here, we propose novel concept reach this goal. two-pulse sequence, apply an additional...