Florian Elsen
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View article: Quantum frequency conversion of single photons from a tin-vacancy center in diamond
Quantum frequency conversion of single photons from a tin-vacancy center in diamond Open
Diamond tin-vacancy (SnV) centers are promising candidates for building quantum network nodes. However, their native photon emission at 619 nm is incompatible with metropolitan-scale networks operating at low-loss telecom wavelengths. To a…
View article: Quantum Frequency Conversion of Single Photons from a Tin-Vacancy Center in Diamond
Quantum Frequency Conversion of Single Photons from a Tin-Vacancy Center in Diamond Open
Diamond tin-vacancy (SnV) centers are promising candidates for building quantum network nodes. However, their native photon emission at 619 nm is incompatible with metropolitan-scale networks operating at low-loss telecom wavelengths. To a…
View article: Metropolitan-scale heralded entanglement of solid-state qubits
Metropolitan-scale heralded entanglement of solid-state qubits Open
A key challenge toward future quantum internet technology is connecting quantum processors at metropolitan scale. Here, we report on heralded entanglement between two independently operated quantum network nodes separated by 10 kilometers.…
View article: Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters
Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters Open
We present a highly efficient low-noise quantum frequency converter from the visible range to telecom wavelengths, combining a pump laser at intermediate frequency resonantly enhanced in an actively stabilized cavity with a monocrystalline…
View article: Metropolitan-scale heralded entanglement of solid-state qubits
Metropolitan-scale heralded entanglement of solid-state qubits Open
A key challenge towards future quantum internet technology is connecting quantum processors at metropolitan scale. Here, we report on heralded entanglement between two independently operated quantum network nodes separated by 10km. The two…
View article: Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters
Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters Open
In this paper, we present a novel single stage quantum frequency conversion (QFC) scheme based on an enhancement cavity, which allows for high conversion efficiencies with record low noise levels, 100 times smaller than in previous systems…
View article: Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters
Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters Open
In this paper, we present a novel single stage quantum frequency conversion (QFC) scheme based on an enhancement cavity, which allows for high conversion efficiencies with record low noise levels, 100 times smaller than in previous systems…
View article: A Telecom Infrastructure Compatible Quantum Link Using NV-centers
A Telecom Infrastructure Compatible Quantum Link Using NV-centers Open
We show the latest progress towards establishing a solid-state, metropolitan quantum link, consisting of two remote Nitrogen Vacancy (NV)-centers and a central measurement station. The entanglement is generated by converting single emitted…
View article: Optical imaging and tracking of single molecules in ultrahigh vacuum
Optical imaging and tracking of single molecules in ultrahigh vacuum Open
Molecule-surface interaction is key to many physical and chemical processes at interfaces. Here, we show that the dynamics of single molecules on a surface under ultrahigh vacuum can be resolved using fluorescence imaging. By adapting oil-…
View article: Demonstration of a 100-mJ OPO/OPA for future lidar applications and laser-induced damage threshold testing of optical components for MERLIN
Demonstration of a 100-mJ OPO/OPA for future lidar applications and laser-induced damage threshold testing of optical components for MERLIN Open
In the field of atmospheric research, lidar is a powerful technology that can measure gas or aerosol concentrations, wind speed, or temperature profiles remotely. To conduct such measurements globally, spaceborne systems are advantageous. …
View article: Demonstration of a 500 mJ InnoSlab-amplifier for future lidar applications
Demonstration of a 500 mJ InnoSlab-amplifier for future lidar applications Open
In the field of atmospheric research lidar is a powerful technology to measure remotely different parameters like gas or aerosol concentrations, wind speed or temperature profiles. For global coverage, spaceborne systems are advantageous. …