203 citations · 292 across the 11 of their papers we have counts for
11 papers
Efficient formation and identification of single emitters in 4H-SiC following maskless heavy ion implantation
S. Eserin, L. K. S. Zimmermann, E. Schneider +12
Single photon emitters in silicon carbide (SiC) are a leading platform for scalable quantum technologies. Recent interest has focused on oxygen-vacancy-related emitters, which show…
Indistinguishability of photonic qubits emitted from trapped Ca ions via pulsed excitation
Pascal Baumgart, Max Bergerhoff, Jonas Meiers +2
We investigate the indistinguishability of Raman photons generated from two trapped Ca ions using few-nanosecond excitation pulses. We elucidate how spontaneous scatteri…
Demonstration of quantum network protocols over a 14-km urban fiber link
Stephan Kucera, Christian Haen, Elena Arenskötter +9
We report on the implementation of quantum entanglement distribution and quantum state teleportation over a 14.4-km urban dark-fiber link, which is partially underground, partially…
Quantum repeater node with free-space coupled trapped ions
Max Bergerhoff, Omar Elshehy, Stephan Kucera +2
The quantum repeater cell is a basic building block for a quantum network, as it allows to overcome the distance limitations due to unavoidable fiber loss in direct transmission. W…
Calibration-Independent Certification of a Quantum Frequency Converter
Matthias Bock, Pavel Sekatski, Jean-Daniel Bancal +5
We report on a method to certify a unitary operation with the help of source and measurement apparatuses whose calibration throughout the certification process needs not be trusted…
Full Bell-basis measurement of an atom-photon 2-qubit state and its application for quantum networks
Elena Arenskötter, Stephan Kucera, Omar Elshehy +4
The efficiency of a Bell-state measurement on photon pairs is bound to 50\,\% due to the number of Bell states that can be distinguished using linear optics. Here we present the im…
Telecom Quantum Photonic Interface for a Ca Single-Ion Quantum Memory
Elena Arenskötter, Tobias Bauer, Stephan Kucera +3
Entanglement-based quantum networks require quantum photonic interfaces between stationary quantum memories and photons, enabling entanglement distribution. Here we present such a…
High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion
Matthias Bock, Pascal Eich, Stephan Kucera +4
Entanglement between a stationary quantum system and a flying qubit is an essential ingredient of a quantum-repeater network. It has been demonstrated for trapped ions, trapped ato…
Doubly-heralded single-photon absorption by a single atom
José Brito, Stephan Kucera, Pascal Eich +2
We report on a single-photon-to-single-atom interface, where a single photon generated by Spontaneous Parametric Down Conversion (SPDC) is absorbed by a single trapped ion. The pho…
Quantum and classical telecommunication channel multiplexing
Andreas Lenhard, José Brito, Stephan Kucera +3
We demonstrate the multiplexing of a classical coherent and a quantum state of light in a single telecommunciation fiber. For this purpose we make use of spontaneous parametric dow…
Telecom-heralded single photon absorption by a single atom
Andreas Lenhard, Matthias Bock, Stephan Kucera +5
We present, characterize, and apply a photonic quantum interface between the near infrared and telecom spectral regions. A singly resonant optical parametric oscillator (OPO) opera…