A5089563201- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Optical Network Technologies
- Mechanical and Optical Resonators
- Quantum optics and atomic interactions
- Nanowire Synthesis and Applications
- Near-Field Optical Microscopy
- Quantum Dots Synthesis And Properties
Leibniz University Hannover
2022-2024
Abstract Quantum key distribution (QKD) enables the transmission of information that is secure against general attacks by eavesdroppers. The use on-demand quantum light sources in QKD protocols expected to help improve security and maximum tolerable loss. Semiconductor dots (QDs) are a promising building block for communication applications because deterministic emission single photons with high brightness low multiphoton contribution. Here we report on first intercity experiment using...
Solid-state quantum platforms have great potential as well-controllable, scalable devices for applications in communication. Semiconductor dots are a leading candidate the deterministic generation of high-quality single or entangled photons. Wavelength tunability is fundamental requirement interference large number local emitters, enhancing their scalability. Here, we explore strain tuning GaAs/AlGaAs emitting photons close to transitions negatively charged Si-vacancy centers diamonds, which...
The on-chip integration of single photon and entangled emitters such as epitaxially grown semiconductor quantum dots into photonic frameworks is a rapidly evolving research field. GaAs offer high purity degree entanglement due to, in part, exhibiting very small fine structure splitting along with short radiative lifetimes. Integrating strain-tunable nanostructures enhances the optical fingerprint, i.e., lifetimes coupling these sources, allows for manipulation routing generated states light....
Quantum key distribution (QKD) enables the transmission of information that is secure against general attacks by eavesdroppers. The use on-demand quantum light sources in QKD protocols expected to help improve security and maximum tolerable loss. Semiconductor dots (QDs) are a promising building block for communication applications because deterministic emission single photons with high brightness low multiphoton contribution. Here we report on first intercity experiment using bright photon...
Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent quantum technologies. They known for the ability to generate discrete states on-demand with low multiphoton emission, near-unity fidelity, and high single photon indistinguishability. However, dots typically suffer from luminescence blinking, lowering efficiency source hampering their scalable application in networks. In this paper, we investigate adjust intermittence neutral exciton emission...
Semiconductor quantum dots are promising building blocks for communication applications. Although deterministic, efficient, and coherent emission of entangled photons has been realized, implementing a practical repeater remains outstanding. Here we explore the statistical limits entanglement swapping with sources polarization-entangled from commonly used biexciton-exciton cascade. We stress necessity tuning exciton fine structure, explain why often observed time evolution photonic in is not...
The on-chip integration of single photon and entangled emitters such as epitaxially grown semiconductor quantum dots (QDs) into photonic frameworks is a rapidly evolving research field. GaAs QDs offer high purity degree entanglement due to in part exhibiting very small fine structure splitting, along with short radiative lifetimes. Integrating strain-tunable nanostructures enhances the optical fingerprint these sources allows for manipulation routing generated states light. Efficient...
The on-chip integration of single photon and entangled emitters such as epitaxially grown semiconductor quantum dots (QDs) into photonic frameworks is a rapidly evolving research field. GaAs QDs offer high purity degree entanglement due to in part exhibiting very small fine structure splitting, along with short radiative lifetimes. Integrating strain-tunable nanostructures enhances the optical fingerprint these sources allows for manipulation routing generated states light. Efficient...
The surface of semiconductor nanostructures has a major impact on their electronic and optical properties. Disorder defects in the layer typically cause degradation charge carrier transport radiative recombination dynamics. However, vicinity is inevitable for many scalable nano-optical applications. Epitaxially grown quantum dots are best candidate high-performance single photon emission show great potential technologies. Yet, these emitters only reveal excellent properties if they deeply...