Prof. Dr. Tim Schröder
Profil
Forschungsthemen8
Diamant-Nanophotonik für On-Chip Quantentechnologie (DiNOQuant)
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 10/2018 - 09/2025 Projektleitung: Prof. Dr. Tim Schröder
EQUAL - Erbium-based silicon quantum light sources
Quelle ↗Förderer: Öffentliche Förderorganisationen anderer Länder Zeitraum: 04/2025 - 03/2030 Projektleitung: Prof. Dr. Tim Schröder
Multidimensional Hyperentangled Photon Graph States: Creation, Validation and Application (HyperGraph)
Quelle ↗Förderer: Horizon Europe: ERC Consolidator Grant Zeitraum: 12/2025 - 11/2030 Projektleitung: Prof. Dr. Tim Schröder, Dr. Gregor Pieplow
Quanten-photonisch integrierter skalierbarer Speicher
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2026 - 12/2028 Projektleitung: Prof. Dr. Tim Schröder, Dr. Gregor Pieplow
Quantum Repeater Architectures Based on Quantum Memories and Photonic Encoding (QUREP)
Quelle ↗Förderer: Horizon 2020: ERC Starting Grant Zeitraum: 12/2020 - 11/2025 Projektleitung: Prof. Dr. Tim Schröder
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2026 - 03/2027 Projektleitung: Dr. Sven Ramelow, Prof. Dr. Tim Schröder, Prof. Dr. rer. nat. Oliver Benson
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2026 - 03/2027 Projektleitung: Prof. Dr. Tim Schröder, Dr. Sven Ramelow, Prof. Dr. rer. nat. Oliver Benson
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2026 - 03/2027 Projektleitung: Prof. Dr. rer. nat. Oliver Benson, Prof. Dr. Tim Schröder, Dr. Sven Ramelow
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Stand: 26.4.2026, 19:48:44 (Top-K=20, Min-Cosine=0.4)
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Journal of the Optical Society of America B · 235 Zitationen · DOI
The past two decades have seen great advances in developing color centers in diamond for sensing, quantum information processing, and tests of quantum foundations. Increasingly, the success of these applications as well as fundamental investigations of light–matter interaction depend on improved control of optical interactions with color centers—from better fluorescence collection to efficient and precise coupling with confined single optical modes. Wide ranging research efforts have been undertaken to address these demands through advanced nanofabrication of diamond. This review will cover recent advances in diamond nano- and microphotonic structures for efficient light collection, color center to nanocavity coupling, hybrid integration of diamond devices with other material systems, and the wide range of fabrication methods that have enabled these complex photonic diamond systems.
Nature Communications · 223 Zitationen · DOI
The controlled creation of defect centre-nanocavity systems is one of the outstanding challenges for efficiently interfacing spin quantum memories with photons for photon-based entanglement operations in a quantum network. Here we demonstrate direct, maskless creation of atom-like single silicon vacancy (SiV) centres in diamond nanostructures via focused ion beam implantation with ∼32 nm lateral precision and <50 nm positioning accuracy relative to a nanocavity. We determine the Si+ ion to SiV centre conversion yield to be ∼2.5% and observe a 10-fold conversion yield increase by additional electron irradiation. Low-temperature spectroscopy reveals inhomogeneously broadened ensemble emission linewidths of ∼51 GHz and close to lifetime-limited single-emitter transition linewidths down to 126±13 MHz corresponding to ∼1.4 times the natural linewidth. This method for the targeted generation of nearly transform-limited quantum emitters should facilitate the development of scalable solid-state quantum information processors.
Nano Letters · 221 Zitationen · DOI
Efficient collection of the broadband fluorescence from the diamond nitrogen vacancy (NV) center is essential for a range of applications in sensing, on-demand single photon generation, and quantum information processing. Here, we introduce a circular "bullseye" diamond grating which enables a collected photon rate of (2.7 ± 0.09) × 10(6) counts per second from a single NV with a spin coherence time of 1.7 ± 0.1 ms. Back-focal-plane studies indicate efficient redistribution of the NV photoluminescence into low-NA modes by the bullseye grating.
Nature Communications · 207 Zitationen · DOI
A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators. Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks.
Physical Review X · 153 Zitationen · DOI
We propose a novel one-way quantum repeater architecture based on photonic tree-cluster states. Encoding a qubit in a photonic tree cluster protects the information from transmission loss and enables long-range quantum communication through a chain of repeater stations. As opposed to conventional approaches that are limited by the two-way communication time, the overall transmission rate of the current quantum repeater protocol is determined by the local processing time enabling very high communication rates. We further show that such a repeater can be constructed with as little as two stationary qubits and one quantum emitter per repeater station, which significantly increases the experimental feasibility. We discuss potential implementations with diamond defect centers and semiconductor quantum dots efficiently coupled to photonic nanostructures and outline how such systems may be integrated into repeater stations.
Advanced Materials · 150 Zitationen · DOI
Room-temperature quantum emitters in gallium nitride (GaN) are reported. The emitters originate from cubic inclusions in hexagonal lattice and exhibit narrowband luminescence in the red spectral range. The sources are found in different GaN substrates, and therefore are promising for scalable quantum technologies.
Nature Nanotechnology · 112 Zitationen · DOI
Nano Letters · 111 Zitationen · DOI
The combination of long spin coherence time and nanoscale size has made nitrogen vacancy (NV) centers in nanodiamonds the subject of much interest for quantum information and sensing applications. However, currently available high-pressure high-temperature (HPHT) nanodiamonds have a high concentration of paramagnetic impurities that limit their spin coherence time to the order of microseconds, less than 1% of that observed in bulk diamond. In this work, we use a porous metal mask and a reactive ion etching process to fabricate nanocrystals from high-purity chemical vapor deposition (CVD) diamond. We show that NV centers in these CVD nanodiamonds exhibit record-long spin coherence times in excess of 200 μs, enabling magnetic field sensitivities of 290 nT Hz(-1/2) with the spatial resolution characteristic of a 50 nm diameter probe.
Nanotechnology · 108 Zitationen · DOI
Quantum phenomena are typically observable at length and time scales smaller than those of our everyday experience, often involving individual particles or excitations. The past few decades have seen a revolution in the ability to structure matter at the nanoscale, and experiments at the single particle level have become commonplace. This has opened wide new avenues for exploring and harnessing quantum mechanical effects in condensed matter. These quantum phenomena, in turn, have the potential to revolutionize the way we communicate, compute and probe the nanoscale world. Here, we review developments in key areas of quantum research in light of the nanotechnologies that enable them, with a view to what the future holds. Materials and devices with nanoscale features are used for quantum metrology and sensing, as building blocks for quantum computing, and as sources and detectors for quantum communication. They enable explorations of quantum behaviour and unconventional states in nano- and opto-mechanical systems, low-dimensional systems, molecular devices, nano-plasmonics, quantum electrodynamics, scanning tunnelling microscopy, and more. This rapidly expanding intersection of nanotechnology and quantum science/technology is mutually beneficial to both fields, laying claim to some of the most exciting scientific leaps of the last decade, with more on the horizon.
Nature Communications · 106 Zitationen · DOI
Optical spectroscopy is a fundamental tool in numerous areas of science and technology. Much effort has focused on miniaturizing spectrometers, but thus far at the cost of spectral resolution and broad operating range. Here we describe a compact spectrometer that achieves both high spectral resolution and broad bandwidth. The device relies on imaging multimode interference from leaky modes along a multimode tapered optical fibre, resulting in spectrally distinguishable spatial patterns over a wide range of wavelengths from 500 to 1,600 nm. This tapered fibre multimode interference spectrometer achieves a spectral resolution down to 40 pm in the visible spectrum and 10 pm in the near-infrared spectrum (corresponding to resolving powers of 10(4)-10(5)). Multimode interference spectroscopy is suitable in a variety of device geometries, including planar waveguides in a broad range of transparent materials.
Nano Letters · 97 Zitationen · DOI
Quantum emitters in solids are being developed for a range of quantum technologies, including quantum networks, computing, and sensing. However, a remaining challenge is the poor photon collection due to the high refractive index of most host materials. Here we overcome this limitation by introducing monolithic parabolic reflectors as an efficient geometry for broadband photon extraction from quantum emitter and experimentally demonstrate this device for the nitrogen-vacancy (NV) center in diamond. Simulations indicate a photon collection efficiency exceeding 75% across the visible spectrum and experimental devices, fabricated using a high-throughput gray scale lithography process, demonstrating a photon extraction efficiency of (41 ± 5)%. This device enables a raw experimental detection efficiency of (12 ± 1)% with fluorescence detection rates as high as (4.114 ± 0.003) × 10<sup>6</sup> counts per second (cps) from a single NV center. Enabled by our deterministic emitter localization and fabrication process, we find a high number of exceptional devices with an average count rate of (3.1 ± 0.9) × 10<sup>6</sup> cps.
arXiv (Cornell University) · 93 Zitationen · DOI
Efficient collection of the broadband fluorescence of the diamond nitrogen vacancy center is essential for a range of applications in sensing, on-demand single photon generation, and quantum information processing. Here, we introduce a circular `bullseye' diamond grating enabling a collected photon rate of $(3.0\pm0.1)\times10^6$ counts per second from a single nitrogen-vacancy center with a spin coherence time of 1.7$\pm$0.1 ms. Back-focal-plane studies indicate efficient redistribution into low-NA modes.
Optica · 92 Zitationen · DOI
Single-photon sources are of paramount importance in quantum communication, quantum computation, and quantum metrology. In particular, there is great interest in realizing scalable solid-state platforms that can emit triggered photons on demand to achieve scalable nanophotonic networks. We report on a visible-spectrum single-photon emitter in 4H silicon carbide (SiC). The emitter is photostable at room and low temperatures, enabling photon counts per second in excess of 2$\times$10$^6$ from unpatterned bulk SiC. It exists in two orthogonally polarized states, which have parallel absorption and emission dipole orientations. Low-temperature measurements reveal a narrow zero phonon line (linewidth $<0.1~$nm) that accounts for $>30$% of the total photoluminescence spectrum.
KZfSS Kölner Zeitschrift für Soziologie und Sozialpsychologie · 63 Zitationen · DOI
Scientific Reports · 60 Zitationen · DOI
A major challenge in nanofabrication is to pattern unconventional substrates that cannot be processed for a variety of reasons, such as incompatibility with spin coating, electron beam lithography, optical lithography, or wet chemical steps. Here, we present a versatile nanofabrication method based on re-usable silicon membrane hard masks, patterned using standard lithography and mature silicon processing technology. These masks, transferred precisely onto targeted regions, can be in the millimetre scale. They allow for fabrication on a wide range of substrates, including rough, soft and non-conductive materials, enabling feature linewidths down to 10 nm. Plasma etching, lift-off and ion implantation are realized without the need for scanning electron/ion beam processing, UV exposure, or wet etching on target substrates.
Optics Express · 49 Zitationen · DOI
The practical implementation of many quantum technologies relies on the development of robust and bright single photon sources that operate at room temperature. The negatively charged silicon-vacancy (SiV<sup>-</sup>) color center in diamond is a possible candidate for such a single photon source. However, due to the high refraction index mismatch to air, color centers in diamond typically exhibit low photon out-coupling. An additional shortcoming is due to the random localization of native defects in the diamond sample. Here we demonstrate deterministic implantation of Si ions with high conversion efficiency to single SiV<sup>-</sup> centers, targeted to fabricated nanowires. The co-localization of single SiV<sup>-</sup> centers with the nanostructures yields a ten times higher light coupling efficiency than for single SiV<sup>-</sup> centers in bulk diamond. This enhanced photon out-coupling, together with the intrinsic scalability of the SiV<sup>-</sup> creation method, enables a new class of devices for integrated photonics and quantum science.
Critical Care Medicine · 47 Zitationen · DOI
Volatile sedation is feasible in cardiac arrest survivors. Prospective controlled studies are necessary to confirm the beneficial effects on duration of ventilation and length of ICU stay observed in our study. Our data argue against a major effect on neurologic outcome. Close monitoring of PaCO2 is necessary during sedation via anesthetic conserving device.
Physical Review X · 45 Zitationen · DOI
An analysis and improvement of the spectral properties of nitrogen-vacancy defects in diamond nanostructures paves the way for efficient entanglement generation necessary for many quantum information applications.
Applied Physics Letters · 44 Zitationen · DOI
A scalable approach for integrated photonic networks in single-crystal diamond using triangular etching of bulk samples is presented. We describe designs of high quality factor (Q = 2.51 × 106) photonic crystal cavities with low mode volume (Vm = 1.062 × (λ/n)3), which are connected via waveguides supported by suspension structures with predicted transmission loss of only 0.05 dB. We demonstrate the fabrication of these structures using transferred single-crystal silicon hard masks and angular dry etching, yielding photonic crystal cavities in the visible spectrum with measured quality factors in excess of Q = 3 × 103.
APL Photonics · 38 Zitationen · DOI
We demonstrate a self-aligned lithographic technique for precision generation of nitrogen vacancy (NV) centers within photonic nanostructures on bulk diamond substrates. The process relies on a lithographic mask with nanoscale implantation apertures for NV creation, together with larger features for producing waveguides and photonic nanocavities. This mask allows targeted nitrogen ion implantation, and precision dry etching of nanostructures on bulk diamond. We demonstrate high-yield generation of single NVs at pre-determined nanoscale target regions on suspended diamond waveguides. We report implantation into the mode maximum of diamond photonic crystal nanocavities with a single-NV per cavity yield of ∼26% and Purcell induced intensity enhancement of the zero-phonon line. The generation of NV centers aligned with diamond photonic structures marks an important tool for scalable production of optically coupled spin memories.
Physical Review Letters · 37 Zitationen · DOI
We characterize a high-density sample of negatively charged silicon-vacancy (SiV^{-}) centers in diamond using collinear optical multidimensional coherent spectroscopy. By comparing the results of complementary signal detection schemes, we identify a hidden population of SiV^{-} centers that is not typically observed in photoluminescence and which exhibits significant spectral inhomogeneity and extended electronic T_{2} times. The phenomenon is likely caused by strain, indicating a potential mechanism for controlling electric coherence in color-center-based quantum devices.
Optical Materials Express · 34 Zitationen · DOI
Towards building large-scale integrated photonic systems for quantum information processing, spatial and spectral alignment of single quantum systems to photonic nanocavities is required. Here, we demonstrate spatially targeted implantation of nitrogen vacancy (NV) centers into the mode maximum of 2-d diamond photonic crystal cavities with quality factors up to 8000, achieving an average of 1:1 0:2 NVs per cavity. Nearly all NV-cavity systems have significant emission intensity enhancement, reaching a cavity-fed spectrally selective intensity enhancement, Fint, of up to 93. Although spatial NV-cavity overlap is nearly guaranteed within about 40 nm, spectral tuning of the NV’s zero-phonon-line (ZPL) is still necessary after fabrication. To demonstrate spectral control, we temperature tune a cavity into an NV ZPL, yielding FZPL int ~ 5 at cryogenic temperatures.
Anti-Cancer Agents in Medicinal Chemistry · 31 Zitationen · DOI
Plasma-treated PBS inhibited cell growth in 2D and 3D models of cancer. These results may help facilitate the development of new plasma-derived anticancer agent with clinical relevance in the future.
Physical Review X · 31 Zitationen · DOI
Quantum networks built out of distinct quantum bits (qubits) connected via photons may enable quantum computation and long-distance communication. The high yield integration of high-quality solid-state qubits into an on-chip photonic circuit could provide a stable and scalable architecture to build such a network.
British Journal of Anaesthesia · 27 Zitationen · DOI
Kooperationen8
Bestätigte Forscher↔Partner-Paare aus HU-FIS — Gold-Standard-Positive für das Matching.
EQUAL - Erbium-based silicon quantum light sources
university
EQUAL - Erbium-based silicon quantum light sources
other
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Technologien und Demonstratoren für Quantenrepeater, TD.QR, Teilprojekt: 3-Knoten-Verschränkung von Quanten- speichern über eine 52km Telekomfaserverbindung
university
Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
- Name
- Prof. Dr. Tim Schröder
- Titel
- Prof. Dr.
- Fakultät
- Mathematisch-Naturwissenschaftliche Fakultät
- Institut
- Institut für Physik
- Arbeitsgruppe
- Integrierte Quantenphotonik
- Telefon
- +49 30 2093-4818
- HU-FIS-Profil
- Quelle ↗
- Zuletzt gescrapt
- 26.4.2026, 01:12:15