TRR 142 - Ultrafast coherent opto-electronic control of a photonic quantum system (B06*)
In this project we will integrate semiconductor quantum dots in field-tunable microcavity heterostructures to achieve ultrafast coherent opto-electronic control of the emitter cavity coupling. By tuning different quantum dot transitions in and out of the cavity resonance we aim to generate (i) cavity assisted two-photon emission, (ii) hyper ...
Duration: 01/2022 - 12/2026
Funded by: DFG
TRR 142 - Polaron signatures in the optical response of lithium niobate (B07*)
This joint theory-experiment project will explore the rich physics of polarons and their optical signatures. In particular, we plan to resolve their influence on the linear and nonlinear optical properties of the material as well as their condensation, hopping and dissociation characteristics in interaction with intrinsic and extrinsic point ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Subcycle nonlinearities of ultrastrong light-matter coupling (B08*)
In this project we will investigate subcycle nonlinearities of highly narrowband THz cavity polaritons in the deep-strong light-matter coupling regime. Cyclotron and intersubband resonances of n-type modulation-doped GaAs/AlxGa1-xAs multi quantum wells fabricated by molecular beam epitaxy will be coupled to a novel generation of THz metal ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Quasi-bound states in the continuum for efficient second harmonic generation and spatial phase tailoring in GaAs metasurfaces (B09*)
In this project, we aim at exploiting highly efficient quasi-bound states in the continuum for optical modes in GaAs nanoresonators. The strong field confinement of these modes will be utilized to tailor the phase and emission patterns of light generated by nonlinear optical processes and to increase the efficiency of light-matter interaction in ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Cavity-enhanced spontaneous parametric down-conversion with temporal filtering using integrated superconducting detectors (C07*)
In this project, we will study the parametric down-conversion in a cavity with integrated superconducting detectors under cryogenic conditions. By using ultrafast driving electronics, we will implement pump filtering in the time domain, by enabling the integrated detector only after the pump has decayed away. The herald photon remains resonant with ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Hybrid lithium niobate on insulator quantum photonic integrated circuit (C08*)
In this project, we will explore thin-film lithium niobate on insulator (LNOI) as the material platform for quantum photonic integrated circuits. After transfer printing of cavity coupled InAs quantum dots onto a LNOI circuit, we will on-chip frequency convert the on-demand generated photons from the quantum dot using a periodically poled LNOI ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - On-demand ideal photon pair generation for entanglement swapping at telecom frequencies (C09*)
The goal of this project is the demonstration of on-demand ideal photon pair generation for entanglement swapping at telecom frequencies employing quantum dots embedded in circular Bragg grating cavities. The InAs quantum dots in an InxGayAl1-x-yAs-matrix are grown by molecular beam epitaxy and the circular Bragg grating cavity will allow to tune ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Generation and characterization of quantum light in nonlinear systems: A theoretical analysis (C10*)
We develop novel approaches based on integro-differential equations and quantum-channel descriptions for the tailored generation of nonclassical light and its propagation in structured media. By devising a multilinear process matrix formalism and accounting for complex dispersion in photonic crystals, we characterize quantum properties of light. ...
Duration: 01/2022 - 12/2025
Funded by: DFG
TRR 142 - Compact high performance photon pair source using ultrafast hybrid modulators based on CMOS and LNOI (C11*)
The project aims to study and demonstrate miniaturized sources of decorrelated photon pairs with high repetition rate. The goal will be achieved by jointly integrating high-bandwidth electro-optic modulators, and a specifically tailored parametric down-conversion (PDC) section, both in a lithium-niobate-on-insulator (LNOI) platform. To obtain ...
Duration: 01/2022 - 12/2025
Funded by: DFG
Contact: Christian Kress, M.Sc.
PhoQuant: Photonic Quantum Computing - Quantum computing evaluation platform
When a sufficient number of quantum particles are interconnected, quantum computers can handle tasks that are unsolvable for classical computers. This – among other unique selling points – is a major advantage of photonic platforms: Integrated architectures and sophisticated manufacturing processes offer an enormous scaling potential. The aim of ...
Duration: 01/2022 - 12/2026
Funded by: BMBF
Contact: Prof. Dr. Christine Silberhorn, Dr. Benjamin Brecht