Universität Stuttgart

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Subject: search.filters.subject.530Institute: search.filters.UBSInstitut.Stuttgart Research Centre of Photonic Engineering (SCoPE)Institute: search.filters.UBSInstitut.Institut für Halbleiteroptik und Funktionelle GrenzflächenInstitute: search.filters.UBSInstitut.Zentrum für integrierte Quantenwissenschaft und -technologie (IQST)

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Now showing 1 - 9 of 9
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    Integrated optoelectronic devices using lab‐on‐fiber technology
    (2022) Ricciardi, Armando; Zimmer, Michael; Witz, Norbert; Micco, Alberto; Piccirillo, Federica; Giaquinto, Martino; Kaschel, Mathias; Burghartz, Joachim; Jetter, Michael; Michler, Peter; Cusano, Andrea; Portalupi, Simone Luca
    Silica fibers are nowadays cornerstones in several technological implementations from long‐distance communication, to sensing applications in many scenarios. To further enlarge the functionalities, the compactness, and the performances of fiber‐based devices, one needs to reliably integrate small‐footprint components such as sensors, light sources, and detectors onto single optical fiber substrates. Here, a novel proof of concept is presented to deterministically integrate optoelectronic chips onto the facet of an optical fiber, further implementing the electrical contacting between the chip and fiber itself. The CMOS‐compatible procedure is based on a suitable combination of metal deposition, laser machining, and micromanipulation, directly applied onto the fiber tip. The proposed method is validated by transferring, aligning, and bonding a quantum‐well based laser on the core of a multimode optical fiber. The successful monolithic device integration on fiber shows simultaneously electrical contacting between the laser and the ferrule, and 20% light in‐coupling in the fiber. These results pave new ways to develop the next generation of optoelectronic systems on fiber. The technological approach will set a new relevant milestone along the lab‐on‐fiber roadmap, opening new avenues for a novel class of integrated optoelectronic fiber platforms, featuring unrivaled miniaturization, compactness, and performances levels, designed for specific applications.
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    ItemOpen Access
    3D printed micro-optics for quantum technology: Optimised coupling of single quantum dot emission into a single-mode fibre
    (2021) Sartison, Marc; Weber, Ksenia; Thiele, Simon; Bremer, Lucas; Fischbach, Sarah; Herzog, Thomas; Kolatschek, Sascha; Jetter, Michael; Reitzenstein, Stephan; Herkommer, Alois; Michler, Peter; Portalupi, Simone Luca; Giessen, Harald
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    ItemOpen Access
    Thin-film InGaAs metamorphic buffer for telecom C-band InAs quantum dots and optical resonators on GaAs platform
    (2022) Sittig, Robert; Nawrath, Cornelius; Kolatschek, Sascha; Bauer, Stephanie; Schaber, Richard; Huang, Jiasheng; Vijayan, Ponraj; Pruy, Pascal; Portalupi, Simone Luca; Jetter, Michael; Michler, Peter
    The GaAs-based material system is well-known for hosting InAs quantum dots (QDs) with outstanding optical properties, typically emitting at a wavelength of around 900 nm. The insertion of a metamorphic buffer (MMB) can shift this emission to the technologically attractive telecom C-band range centered at 1550 nm. However, the thickness of common MMB designs (>1 μm) limits their compatibility with most photonic resonator types. Here, we report on the metal–organic vapor-phase epitaxy (MOVPE) growth of a novel InGaAs MMB with a nonlinear indium content grading profile designed to maximize plastic relaxation within minimal layer thickness. This allows us to achieve the necessary transition of the lattice constant and to provide a smooth surface for QD growth within 180 nm. Single-photon emission at 1550 nm from InAs QDs deposited on top of this thin-film MMB is demonstrated. The strength of the new design is proven by integrating it into a bullseye cavity via nano-structuring techniques. The presented advances in the epitaxial growth of QD/MMB structures form the basis for the fabrication of high-quality telecom nonclassical light sources as a key component of photonic quantum technologies.
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    ItemOpen Access
    Extending quantum links : modules for fiber‐ and memory‐based quantum repeaters
    (2020) Loock, Peter van; Alt, Wolfgang; Becher, Christoph; Benson, Oliver; Boche, Holger; Deppe, Christian; Eschner, Jürgen; Höfling, Sven; Meschede, Dieter; Michler, Peter; Schmidt, Frank; Weinfurter, Harald
    Elementary building blocks for quantum repeaters based on fiber channels and memory stations are analyzed. Implementations are considered for three different physical platforms, for which suitable components are available: quantum dots, trapped atoms and ions, and color centers in diamond. The performances of basic quantum repeater links for these platforms are evaluated and compared, both for present‐day, state‐of‐the‐art experimental parameters as well as for parameters that can in principle be reached in the future. The ultimate goal is to experimentally explore regimes at intermediate distances - up to a few 100 km - in which the repeater‐assisted secret key transmission rates exceed the maximal rate achievable via direct transmission. Two different protocols are considered, one of which is better adapted to the higher source clock rate and lower memory coherence time of the quantum dot platform, while the other circumvents the need of writing photonic quantum states into the memories in a heralded, nondestructive fashion. The elementary building blocks and protocols can be connected in a modular form to construct a quantum repeater system that is potentially scalable to large distances.
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    ItemOpen Access
    Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths
    (2022) Dusanowski, Łukasz; Nawrath, Cornelius; Portalupi, Simone Luca; Jetter, Michael; Huber, Tobias; Klembt, Sebastian; Michler, Peter; Höfling, Sven
    Solid-state quantum emitters with manipulable spin-qubits are promising platforms for quantum communication applications. Although such light-matter interfaces could be realized in many systems only a few allow for light emission in the telecom bands necessary for long-distance quantum networks. Here, we propose and implement an optically active solid-state spin-qubit based on a hole confined in a single InAs/GaAs quantum dot grown on an InGaAs metamorphic buffer layer emitting photons in the C-band. We lift the hole spin-degeneracy using an external magnetic field and demonstrate hole injection, initialization, read-out and complete coherent control using picosecond optical pulses. These results showcase a solid-state spin-qubit platform compatible with preexisting optical fiber networks.
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    ItemOpen Access
    Surface relief VCSELs at 670 nm with integrated polymer microlens for highly collimated fundamental-mode emission
    (2024) Engel, Lena; Khamseh, Farnaz; Zimmer, Michael; Jetter, Michael; Michler, Peter
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    ItemOpen Access
    High-fidelity distribution of triggered polarization-entangled telecom photons via a 36 km intra-city fiber network
    (2024) Strobel, Tim; Kazmaier, Stefan; Bauer, Tobias; Schäfer, Marlon; Choudhary, Ankita; Sharma, Nand Lal; Joos, Raphael; Nawrath, Cornelius; Weber, Jonas H.; Nie, Weijie; Bhayani, Ghata; Wagner, Lukas; Bisquerra, André; Geitz, Marc; Braun, Ralf-Peter; Hopfmann, Caspar; Portalupi, Simone Luca; Becher, Christoph; Michler, Peter
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    Monolithic integration of one VCSEL on a single mode fiber
    (2025) Piccirillo, Federica; Zimmer, Michael; Giaquinto, Martino; Micco, Alberto; Jetter, Michael; Michler, Peter; Cusano, Andrea; Portalupi, Simone Luca; Ricciardi, Armando
    The implementation of compact fiber-coupled light sources and devices represents a highly sought through technological goal, in wearable technologies, point-of-care units, telecommunication, and even quantum technology. In particular, a strong reduction of the overall device footprint, still ensuring a compact electrical contacting, would play an important role for electrically driven and electrically controlled devices. Here we show the integration of electrically pumped vertical-cavity surface-emitting lasers on multi-mode and single-mode fibers. The optimized integration technique is enabled by the advanced fiber-to-laser coupling design allowed by a detailed numerical investigation, as well as by an improved technological approach. While for the integration on multimode fibers, an important improvement over state-of-the-art is achieved, the integration on single-mode fiber is here demonstrated for the first time. All experimental results include reproducibility studies to show that the developed technique can be considered for larger scale implementations and are further supported by numerical investigation. This work marks an important step forward in the miniaturization of fiber-based optoelectronics devices which will be highly beneficial for various research and technology developments.
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    Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots
    (2025) Strobel, Tim; Vyvlecka, Michal; Neureuther, Ilenia; Bauer, Tobias; Schäfer, Marlon; Kazmaier, Stefan; Sharma, Nand Lal; Joos, Raphael; Weber, Jonas H.; Nawrath, Cornelius; Nie, Weijie; Bhayani, Ghata; Hopfmann, Caspar; Becher, Christoph; Michler, Peter; Portalupi, Simone Luca
    A global quantum internet is based on scalable networks, which require reliable quantum hardware. Among them are quantum light sources providing deterministic, high-brightness, high-fidelity entangled photons and quantum memories with coherence times exceeding the millisecond range. Long-distance operation demands quantum light sources emitting at telecommunication wavelengths. A cornerstone for such networks is the demonstration of quantum teleportation. Here, we realize full-photonic quantum teleportation employing semiconductor quantum dots, which can fulfill all the aforementioned requirements. Two remote GaAs quantum dots, emitting in the near-infrared, are used: one as an entangled-photon pair source and the other as a single-photon source. During the experiment, the single photon is prepared in conjugate polarization states and interfaced with the biexciton emission of the entangled pair employing a polarization-selective Bell state measurement. This process teleports the respective polarization state onto the exciton emission of the entangled pair. The frequency mismatch between the triggered sources is erased using two polarization-preserving quantum frequency converters, enabling remote two-photon interference at telecommunication wavelengths, yielding a visibility of 30(1)%. A post-selected teleportation fidelity up to 0.721(33), significantly above the classical limit, demonstrates successful quantum teleportation between light from distinct sources. These results mark an important development for semiconductor-based quantum light sources.