Year: 2024
Type: preprint
Abstract: Emitters in high refractive index materials like 4H-SiC suffer from reduced detection of photons because of losses caused by total internal reflection. Thus, integration into efficient nanophotonic structures which couple the emission of photons to a well defined waveguide mode can significantly enhance the photon detection efficiency. In addition, interfacing this waveguide to a classical fiber network is of similar importance to detect the photons and perform experiments. Here, we show a waveguide fiber interface in SiC. By careful measurements we determine efficiencies exceeding 93 % for the transfer of photons from SiC nanobeams to fibers. We use this interface to create a bright single photon source based on waveguide integrated V2 defects in 4H-SiC and achieve an overall photon count rate of 181 kilo-counts per second. We observe and quantify the strain induced shift of the ground state spin states and demonstrate coherent control of the electron spin with a coherence time of T2=42.5 $\rmμ$s.
Source: arXiv (Cornell University)
Institutions: University of Stuttgart, Center for Integrated Quantum Science and Technology, University of Luxembourg, Luxembourg Institute of Science and Technology, Max Planck Institute for Solid State Research, Linköping University, Budapest University of Technology and Economics, HUN-REN Wigner Research Centre for Physics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G1328935976, Quantum Internet Alliance - Phase1, G1957822890, G2076373681, Remote epitaxy of silicon carbide for quantum nanophotonic crystals, Verbundprojekt: Feldtest eines integrierten Quanten-Repeater-Knotens und Entwicklung der zugrundeliegenden kryogenen Umgebung - InQuRe -, Teilvorhaben: Entwicklung eines Quanten-Netzwerk-Knotens basierend auf Farbzentren im Siliziumcarbid, G3105581869, Spin based quantum computer and simulator (SPINUS), G3421355271, GRK 2642: Promovierte Experten für photonische Quantentechnologien, G3881634572, G3898308737, G4633165975, G5032364540, G5239309378, QuantERA ERA-NET Cofund in Quantum Technologies, G575169067, QuantERA II ERA-NET Cofund in Quantum Technologies, G6583516328, G6624113701, Verbundprojekt: Quantenrepeater.Link - QR.X -, Teilvorhaben: Entwicklung modularisierter, systemintegrierter und portabler Hardware für Quantenrepeaterknoten in Glasfaser-basierter Quantenkommunikation, G7796658143, G7862804178, G8784154652
OpenAlex ID: W4390833770