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Author: Schimpf, Christian × DDC: 540 ×

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    Spider chitin: An Ultrafast Microwave-Assisted Method for Chitin Isolation from Caribena versicolor Spider Molt Cuticle
    (Basel : MDPI, 2019) Machałowski, Tomasz; Wysokowski, Marcin; Tsurkan, Mikhail V.; Galli, Roberta; Schimpf, Christian; Rafaja, David; Brendler, Erica; Viehweger, Christine; Zółtowska-Aksamitowska, Sonia; Petrenko, Iaroslav; Czaczyk, Katarzyna; Kraft, Michael; Bertau, Martin; Bechmann, Nicole; Guan, Kaomei; Bornstein, Stefan R.; Voronkina, Alona; Fursov, Andriy; Bejger, Magdalena; Biniek-Antosiak, Katarzyna; Rypniewski, Wojciech; Figlerowicz, Marek; Pokrovsky, Oleg; Jesionowski, Teofil; Ehrlich, Hermann
    Chitin, as a fundamental polysaccharide in invertebrate skeletons, continues to be actively investigated, especially with respect to new sources and the development of effective methods for its extraction. Recent attention has been focused on marine crustaceans and sponges; however, the potential of spiders (order Araneae) as an alternative source of tubular chitin has been overlooked. In this work, we focused our attention on chitin from up to 12 cm-large Theraphosidae spiders, popularly known as tarantulas or bird-eating spiders. These organisms “lose” large quantities of cuticles during their molting cycle. Here, we present for the first time a highly effective method for the isolation of chitin from Caribena versicolor spider molt cuticle, as well as its identification and characterization using modern analytical methods. We suggest that the tube-like molt cuticle of this spider can serve as a naturally prefabricated and renewable source of tubular chitin with high potential for application in technology and biomedicine. © 2019 by the authors.
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    Phonon-Assisted Two-Photon Interference from Remote Quantum Emitters
    (Washington, DC : ACS Publ., 2017-6-7) Reindl, Marcus; Jöns, Klaus D.; Huber, Daniel; Schimpf, Christian; Huo, Yongheng; Zwiller, Val; Rastelli, Armando; Trotta, Rinaldo
    Photonic quantum technologies are on the verge of finding applications in everyday life with quantum cryptography and quantum simulators on the horizon. Extensive research has been carried out to identify suitable quantum emitters and single epitaxial quantum dots have emerged as near-optimal sources of bright, on-demand, highly indistinguishable single photons and entangled photon-pairs. In order to build up quantum networks, it is essential to interface remote quantum emitters. However, this is still an outstanding challenge, as the quantum states of dissimilar “artificial atoms” have to be prepared on-demand with high fidelity and the generated photons have to be made indistinguishable in all possible degrees of freedom. Here, we overcome this major obstacle and show an unprecedented two-photon interference (visibility of 51 ± 5%) from remote strain-tunable GaAs quantum dots emitting on-demand photon-pairs. We achieve this result by exploiting for the first time the full potential of a novel phonon-assisted two-photon excitation scheme, which allows for the generation of highly indistinguishable (visibility of 71 ± 9%) entangled photon-pairs (fidelity of 90 ± 2%), enables push-button biexciton state preparation (fidelity of 80 ± 2%) and outperforms conventional resonant two-photon excitation schemes in terms of robustness against environmental decoherence. Our results mark an important milestone for the practical realization of quantum repeaters and complex multiphoton entanglement experiments involving dissimilar artificial atoms.