We perform extended numerical studies to maximize the overall photon coupling efficiency of fiber-coupled quantum dot single-photon sources emitting in the near-infrared and telecom regime. Using the finite element method,… Weiter »Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots
We propose two schemes to obtain Gottesman-Kitaev-Preskill (GKP) error syndromes by means of linear-optical operations, homodyne measurements, and GKP ancillas. This includes showing that for a concatenation of GKP codes… Weiter »Quantum error correction with higher Gottesman-Kitaev-Preskill codes: Minimal measurements and linear optics
We present an exact rate analysis for a secret key that can be shared among two parties employing a linear quantum repeater chain. One of our main motivations is to… Weiter »Exact rate analysis for quantum repeaters with imperfect memories and entanglement swapping as soon as possible
Color centers in silicon carbide are emerging candidates for distributed spin-based quantum applications due to the scalability of host materials and the demonstration of integration into nanophotonic resonators. Recently, silicon… Weiter »Spin-optical dynamics and quantum efficiency of single V1 center in silicon carbide
Optically active solid-state spin defects have the potential to become a versatile resource for quantum information processing applications. Nitrogen-vacancy defect centers (NV) in diamond act as quantum memories and can… Weiter »Optically coherent nitrogen-vacancy defect centers in diamond nanostructures
Quantum error correcting codes (QECCs) are the means of choice whenever quantum systems suffer errors, e.g., due to imperfect devices, environments, or faulty channels. By now, a plethora of families… Weiter »Optimizing quantum codes with an application to the loss channel with partial erasure information
Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission,… Weiter »Photoneutralization of charges in GaAs quantum dot based entangled photon emitters
Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission,… Weiter »Photoneutralization of charges in GaAs quantum dot based entangled photon emitters
Transmission of classical information over a quantum state-dependent channel is considered, when the encoder can measure channel side information (CSI) and is required to mask information on the quantum channel… Weiter »Classical State Masking over a Quantum Channel
Quantum communication research has in recent years shifted to include multi-partite networks for which questions of quantum network routing naturally emerge. To understand the potential for multi-partite routing, we focus… Weiter »Limitations of nearest-neighbour quantum networks