Dr. Sven Ramelow
Profil
Forschungsthemen11
Mikro-integrierte Hochleistungs-Quellen für die Quantenkommunikation (MIHQU)
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 03/2023 - 09/2026 Projektleitung: Dr. Sven Ramelow
NW/1: Quanten-Bildgebung und Spektroskopie im Mittleren Infrarot
Quelle ↗Förderer: DFG Nachwuchsgruppe Zeitraum: 12/2016 - 04/2021 Projektleitung: Dr. Sven Ramelow
NW/2: Quanten-Bildgebung und Spektroskopie im Mittleren Infrarot
Quelle ↗Förderer: DFG Nachwuchsgruppe Zeitraum: 12/2019 - 11/2021 Projektleitung: Dr. Sven Ramelow
Q.Link.X - Teilvorhaben: Transfer von Spin-Photon-Verschränkung über eine faseroptische Übertragungsstrtecke Unterprojekt 2: Module für Quanten-Frequenz Konversion
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 08/2018 - 07/2021 Projektleitung: Dr. Sven Ramelow
Quanten-Licht für eine neue Bildgebung zur frühen und differenzierten Erkennung von Biomarkern in der personalisierten Medizin (QUEED) – Teilvorhaben: Entwicklung und Laboraufbau Quanteninterferometer-Module und Optimierung Quantensensorisches Messverfahren.
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2023 - 12/2027 Projektleitung: Dr. Sven Ramelow
QUIN: Quanten-OCT keramischer und polymerer Werkstoffe mit verschränkten Photonen im mittleren Infrarot
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 05/2021 - 04/2025 Projektleitung: Dr. Sven Ramelow, Prof. Dr. rer. nat. Oliver Benson
Spektrale Infrarot-Mikroskopie mit Quantenlicht zur mobilen Mikroplastik-Analyse
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 10/2021 - 10/2025 Projektleitung: Dr. Sven Ramelow
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: 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. rer. nat. Oliver Benson, Prof. Dr. Tim Schröder, Dr. Sven Ramelow
Transfer von Spin-Photon-Verschränkung Unterprojekt 1: Neue QKD-Protokolle und Tests Quanten-Faserstrecken
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 08/2018 - 07/2021 Projektleitung: Prof. Dr. rer. nat. Oliver Benson
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Science · 840 Zitationen · DOI
Single photons with helical phase structures may carry a quantized amount of orbital angular momentum (OAM), and their entanglement is important for quantum information science and fundamental tests of quantum theory. Because there is no theoretical upper limit on how many quanta of OAM a single photon can carry, it is possible to create entanglement between two particles with an arbitrarily high difference in quantum number. By transferring polarization entanglement to OAM with an interferometric scheme, we generate and verify entanglement between two photons differing by 600 in quantum number. The only restrictive factors toward higher numbers are current technical limitations. We also experimentally demonstrate that the entanglement of very high OAM can improve the sensitivity of angular resolution in remote sensing.
Nature · 734 Zitationen · DOI
Nature · 661 Zitationen · DOI
Proceedings of the National Academy of Sciences · 334 Zitationen · DOI
Bell's theorem shows that local realistic theories place strong restrictions on observable correlations between different systems, giving rise to Bell's inequality which can be violated in experiments using entangled quantum states. Bell's theorem is based on the assumptions of realism, locality, and the freedom to choose between measurement settings. In experimental tests, "loopholes" arise which allow observed violations to still be explained by local realistic theories. Violating Bell's inequality while simultaneously closing all such loopholes is one of the most significant still open challenges in fundamental physics today. In this paper, we present an experiment that violates Bell's inequality while simultaneously closing the locality loophole and addressing the freedom-of-choice loophole, also closing the latter within a reasonable set of assumptions. We also explain that the locality and freedom-of-choice loopholes can be closed only within nondeterminism, i.e., in the context of stochastic local realism.
Proceedings of the National Academy of Sciences · 329 Zitationen · DOI
Entangled quantum systems have properties that have fundamentally overthrown the classical worldview. Increasing the complexity of entangled states by expanding their dimensionality allows the implementation of novel fundamental tests of nature, and moreover also enables genuinely new protocols for quantum information processing. Here we present the creation of a (100 × 100)-dimensional entangled quantum system, using spatial modes of photons. For its verification we develop a novel nonlinear criterion which infers entanglement dimensionality of a global state by using only information about its subspace correlations. This allows very practical experimental implementation as well as highly efficient extraction of entanglement dimensionality information. Applications in quantum cryptography and other protocols are very promising.
Nature · 295 Zitationen · DOI
New Journal of Physics · 259 Zitationen · DOI
Tests of the predictions of quantum mechanics for entangled systems have provided increasing evidence against local realistic theories. However, there remains the crucial challenge of simultaneously closing all major loopholes-the locality, freedom-of-choice and detection loopholes-in a single experiment. An important sub-class of local realistic theories can be tested with the concept of 'steering'. The term 'steering' was introduced by Schr椩nger in 1935 for the fact that entanglement would seem to allow an experimenter to remotely steer the state of a distant system as in the Einstein-Podolsky-Rosen (EPR) argument. Einstein called this 'spooky action at a distance'. EPR-steering has recently been rigorously formulated as a quantum information task opening it up to new experimental tests. Here, we present the first loophole-free demonstration of EPR-steering by violating three-setting quadratic steering inequality, tested with polarization-entangled photons shared between two distant laboratories. Our experiment demonstrates this effect while simultaneously closing all loopholes: both the locality loophole and a specific form of the freedom-of-choice loophole are closed by having a large separation of the parties and using fast quantum random number generators, and the fair-sampling loophole is closed by having high overall detection efficiency. Thereby, we exclude-for the first time loophole-free-an important class of local realistic theories considered by EPR. Besides its foundational importance, loophole-free steering also allows the distribution of quantum entanglement secure event in the presence of an untrusted party.
Physical Review Letters · 190 Zitationen · DOI
Although frequency multiplexing of information has revolutionized the field of classical communications, the color degree of freedom (DOF) has been used relatively little for quantum applications. We experimentally demonstrate a new hybrid quantum gate that transfers polarization entanglement of nondegenerate photons onto the color DOF. We create, for the first time, high-quality, discretely color-entangled states (with energy band gap up to 8.4 THz) without any spectrally selective filtering, and unambiguously verify and quantify the amount of entanglement (tangle, $0.611\ifmmode\pm\else\textpm\fi{}0.009$) by reconstructing a restricted density matrix; we generate a range of maximally entangled states, including a set of mutually unbiased bases for an encoded qubit space. The technique can be generalized to transfer polarization entanglement onto other photonic DOFs, like orbital angular momentum.
Nature · 187 Zitationen · DOI
Nature · 157 Zitationen · DOI
Physical Review Letters · 144 Zitationen · DOI
Interferometry using discrete energy levels of nuclear, atomic, or molecular systems is the foundation for a wide range of physical phenomena and enables powerful techniques such as nuclear magnetic resonance, electron spin resonance, Ramsey-based spectroscopy, and laser or maser technology. It also plays a unique role in quantum information processing as qubits may be implemented as energy superposition states of simple quantum systems. Here, we demonstrate quantum interference involving energy states of single quanta of light. In full analogy to the energy levels of atoms or nuclear spins, we implement a Ramsey interferometer with single photons. We experimentally generate energy superposition states of a single photon and manipulate them with unitary transformations to realize arbitrary projective measurements. Our approach opens the path for frequency-encoded photonic qubits in quantum information processing and quantum communication.
Scientific Reports · 144 Zitationen · DOI
Quantum Entanglement is widely regarded as one of the most prominent features of quantum mechanics and quantum information science. Although, photonic entanglement is routinely studied in many experiments nowadays, its signature has been out of the grasp for real-time imaging. Here we show that modern technology, namely triggered intensified charge coupled device (ICCD) cameras are fast and sensitive enough to image in real-time the effect of the measurement of one photon on its entangled partner. To quantitatively verify the non-classicality of the measurements we determine the detected photon number and error margin from the registered intensity image within a certain region. Additionally, the use of the ICCD camera allows us to demonstrate the high flexibility of the setup in creating any desired spatial-mode entanglement, which suggests as well that visual imaging in quantum optics not only provides a better intuitive understanding of entanglement but will improve applications of quantum science.
Optics Express · 127 Zitationen · DOI
In order to achieve efficient parametric frequency comb generation in microresonators, external control of coupling between the cavity and the bus waveguide is necessary. However, for passive monolithically integrated structures, the coupling gap is fixed and cannot be externally controlled, making tuning the coupling inherently challenging. We design a dual-cavity coupled microresonator structure in which tuning one ring resonance frequency induces a change in the overall cavity coupling condition. We demonstrate wide extinction tunability with high efficiency by engineering the ring coupling conditions. Additionally, we note a distinct dispersion tunability resulting from coupling two cavities of slightly different path lengths, and present a new method of modal dispersion engineering. Our fabricated devices consist of two coupled high quality factor silicon nitride microresonators, where the extinction ratio of the resonances can be controlled using integrated microheaters. Using this extinction tunability, we optimize comb generation efficiency as well as provide tunability for avoiding higher-order mode-crossings, known for degrading comb generation. The device is able to provide a 110-fold improvement in the comb generation efficiency. Finally, we demonstrate open eye diagrams using low-noise phase-locked comb lines as a wavelength-division multiplexing channel.
Proceedings of the National Academy of Sciences · 115 Zitationen · DOI
The counterintuitive features of quantum physics challenge many common-sense assumptions. In an interferometric quantum eraser experiment, one can actively choose whether or not to erase which-path information (a particle feature) of one quantum system and thus observe its wave feature via interference or not by performing a suitable measurement on a distant quantum system entangled with it. In all experiments performed to date, this choice took place either in the past or, in some delayed-choice arrangements, in the future of the interference. Thus, in principle, physical communications between choice and interference were not excluded. Here, we report a quantum eraser experiment in which, by enforcing Einstein locality, no such communication is possible. This is achieved by independent active choices, which are space-like separated from the interference. Our setup employs hybrid path-polarization entangled photon pairs, which are distributed over an optical fiber link of 55 m in one experiment, or over a free-space link of 144 km in another. No naive realistic picture is compatible with our results because whether a quantum could be seen as showing particle- or wave-like behavior would depend on a causally disconnected choice. It is therefore suggestive to abandon such pictures altogether.
New Journal of Physics · 104 Zitationen · DOI
A significant limitation of practical quantum key distribution (QKD) setups is currently their limited operational range. It has recently been emphasized (Ma et al 2007 Phys. Rev. A 76 012307) that entanglementbased QKD systems can tolerate higher channel losses than systems based on weak coherent laser pulses (WCP), in particular, when the source is located symmetrically between the two communicating parties, Alice and Bob. In the work presented here, we experimentally study this important advantage by implementing different entanglement-based QKD setups on a 144 km free-space link between the two Canary Islands of La Palma and Tenerife. We established three different configurations where the entangled photon source was placed at Alice's location, asymmetrically between Alice and Bob and symmetrically in the middle between Alice and Bob, respectively. The resulting quantum channel attenuations of 35, 58 and 71 dB, respectively, significantly exceed the limit for WCP systems (Ma et al 2007 Phys. Rev. A 76 012307). This confirms that QKD over distances of 300 km and even more is feasible with entangled state sources placed in the middle between Alice and Bob. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Nature Communications · 99 Zitationen · DOI
Integrated quantum optics has the potential to markedly reduce the footprint and resource requirements of quantum information processing systems, but its practical implementation demands broader utilization of the available degrees of freedom within the optical field. To date, integrated photonic quantum systems have primarily relied on path encoding. However, in the classical regime, the transverse spatial modes of a multi-mode waveguide have been easily manipulated using the waveguide geometry to densely encode information. Here, we demonstrate quantum interference between the transverse spatial modes within a single multi-mode waveguide using quantum circuit-building blocks. This work shows that spatial modes can be controlled to an unprecedented level and have the potential to enable practical and robust quantum information processing.
Physical Review A · 89 Zitationen · DOI
We report the efficient creation and detection of hybrid entanglement between one photon's polarization and another photon's complex transverse polarization pattern including various polarization singularities. The polarization measurement of the first photon triggers a polarization-sensitive imaging of its partner photon, the vector photon, using a single-photon-sensitive camera. Thereby, the vector photon's complex polarization pattern is reconstructed tomographically dependent on the type of polarization measurement performed on its partner. To evaluate the quality of the observed patterns, we introduce a fidelity-like measure which compares the reconstructed polarization with the theoretically expected one at every transverse spatial position. We find that the measured polarization patterns and the theory overlap by more than 90%. Moreover, we visualize the varying strengths of polarization entanglement for different transverse regions and demonstrate an interesting phenomenon: Each vector photon can be both entangled and not entangled in polarization with its partner photon. We give an intuitive, information-theoretical explanation for our results. Our results pave the way to study quantum properties of the rich field of such complex light modes with the potential to improve various applications in quantum informational tasks.
Optics Letters · 86 Zitationen · DOI
We demonstrate a degenerate parametric oscillator in a silicon nitride microresonator. We use two frequency-detuned pump waves to perform parametric four-wave mixing and operate in the normal group-velocity dispersion regime to produce signal and idler fields that are frequency degenerate. Our theoretical modeling shows that this regime enables generation of bimodal phase states, analogous to the χ(2)-based degenerate OPO. Our system offers potential for realization of CMOS-chip-based coherent optical computing and an all-optical quantum random number generator.
Optics Express · 84 Zitationen · DOI
Single photons are an important prerequisite for a broad spectrum of quantum optical applications. We experimentally demonstrate a heralded single-photon source based on spontaneous parametric down-conversion in collinear bulk optics, and fiber-coupled bolometric transition-edge sensors. Without correcting for background, losses, or detection inefficiencies, we measure an overall heralding efficiency of 83%. By violating a Bell inequality, we confirm the single-photon character and high-quality entanglement of our heralded single photons which, in combination with the high heralding efficiency, are a necessary ingredient for advanced quantum communication protocols such as one-sided device-independent quantum key distribution.
Physical Review A · 81 Zitationen · DOI
Photons with complex spatial mode structures open up possibilities for new fundamental high-dimensional quantum experiments and for novel quantum information tasks. Here we show entanglement of photons with complex vortex and singularity patterns called Ince-Gauss modes. In these modes, the position and number of singularities vary depending on the mode parameters. We verify two-dimensional and three-dimensional entanglement of Ince-Gauss modes. By measuring one photon and thereby defining its singularity pattern, we nonlocally steer the singularity structure of its entangled partner, while the initial singularity structure of the photons is undefined. In addition we measure an Ince-Gauss specific quantum-correlation function with possible use in future quantum communication protocols.
Physical Review A · 81 Zitationen · DOI
Entangled photons play a pivotal role in the distribution of quantum information in quantum networks. However, the frequency bands for optimal transmission and storage of photons are often not the same. Here, we experimentally demonstrate the coherent frequency conversion of photons entangled in their polarization, a widely used degree of freedom in photonic quantum information processing. We verify the successful entanglement conversion by violating a Clauser-Horne-Shimony-Holt (CHSH) Bell inequality and fully characterize our near-perfect entanglement transfer using both state and process tomography. Our implementation is robust and flexible, making it a practical building block for future quantum networks.
Physical Review A · 69 Zitationen · DOI
We present a quantum-mechanical analysis of the orbital angular momentum of a class of recently discovered elliptically symmetric stable light fields---the so-called Ince-Gauss modes. We study, in a fully quantum formalism, how the orbital angular momentum of these beams varies with their ellipticity, and we discover several compelling features, including nonmonotonic behavior, stable beams with real continuous (noninteger) orbital angular momenta, and orthogonal modes with the same orbital angular momenta. We explore, and explain in detail, the reasons for this behavior. These features may have applications in quantum key distribution, atom trapping, and quantum informatics in general---as the ellipticity opens up an alternative way of navigating the spatial photonic Hilbert space.
Journal of Lightwave Technology · 53 Zitationen · DOI
Single photon detectors are important for a wide range of applications each with their own specific requirements, which makes necessary the precise characterization of detectors. Here, we present a simple and cost-effective methodology of estimating the dark count rate, detection efficiency, and afterpulsing in single photon detectors purely based on their counting statistics. This methodology extends previous work [ <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IEEE J. Quantum Electron</i> ., vol. 47, no. 9, pp. 1251–1256, Sep. 2011], [ <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Electron. Lett.</i> , vol. 38, no. 23, pp. 1468–1469, Nov. 2002]: 1) giving upper and lower bounds of afterpulsing probability, 2) demonstrating that the simple linear approximation, put forward for the first time in [ <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Electron. Lett. </i> , vol. 38, no. 23, pp. 1468–1469, Nov. 2002], yields an estimate strictly exceeding the upper bound of this probability, and 3) assessing the error when using this estimate. We further discuss the requirements on photon counting statistics for applying the linear approximation to different classes of single photon detectors.
Physical Review A · 53 Zitationen · DOI
In a local realist model, physical properties are defined prior to and independent of measurement and no physical influence can propagate faster than the speed of light. Proper experimental violation of a Bell inequality would show that the world cannot be described with such a model. Experiments intended to demonstrate a violation usually require additional assumptions that make them vulnerable to a number of ``loopholes.'' In both pulsed and continuously pumped photonic experiments, an experimenter needs to identify which detected photons belong to the same pair, giving rise to the coincidence-time loophole. Here, via two different methods, we derive Clauser-Horne- and Eberhard-type inequalities that are not only free of the fair-sampling assumption (thus not being vulnerable to the detection loophole), but also free of the fair-coincidence assumption (thus not being vulnerable to the coincidence-time loophole). Both approaches can be used for pulsed as well as for continuously pumped experiments. Moreover, as they can also be applied to already existing experimental data, we finally show that a recent experiment [Giustina et al., Nature (London) 497, 227 (2013)] violated local realism without requiring the fair-coincidence assumption.
Physical Review Letters · 53 Zitationen · DOI
We demonstrate a two-qubit Deutsch-Jozsa algorithm with single photons from a single InP quantum dot. The qubits are implemented via the spatial mode and the polarization of a single photon. Our photon source is operated both under continuous and pulsed excitation, the latter allowing deterministic quantum logic by generating photons on demand with a strong suppression of two-photon events. The computation reached a success probability of up to 79%. We also exploit the concept of decoherence-free subspaces that helps to make our experimental setup robust against sources of phase noise.
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Quanten-Licht für eine neue Bildgebung zur frühen und differenzierten Erkennung von Biomarkern in der personalisierten Medizin (QUEED) – Teilvorhaben: Entwicklung und Laboraufbau Quanteninterferometer-Module und Optimierung Quantensensorisches Messverfahren.
university
Mikro-integrierte Hochleistungs-Quellen für die Quantenkommunikation (MIHQU)
other
Spektrale Infrarot-Mikroskopie mit Quantenlicht zur mobilen Mikroplastik-Analyse
company
Quanten-Licht für eine neue Bildgebung zur frühen und differenzierten Erkennung von Biomarkern in der personalisierten Medizin (QUEED) – Teilvorhaben: Entwicklung und Laboraufbau Quanteninterferometer-Module und Optimierung Quantensensorisches Messverfahren.
other
Quanten-Licht für eine neue Bildgebung zur frühen und differenzierten Erkennung von Biomarkern in der personalisierten Medizin (QUEED) – Teilvorhaben: Entwicklung und Laboraufbau Quanteninterferometer-Module und Optimierung Quantensensorisches Messverfahren.
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
QUIN: Quanten-OCT keramischer und polymerer Werkstoffe mit verschränkten Photonen im mittleren Infrarot
company
Quanten-Licht für eine neue Bildgebung zur frühen und differenzierten Erkennung von Biomarkern in der personalisierten Medizin (QUEED) – Teilvorhaben: Entwicklung und Laboraufbau Quanteninterferometer-Module und Optimierung Quantensensorisches Messverfahren.
university
QUIN: Quanten-OCT keramischer und polymerer Werkstoffe mit verschränkten Photonen im mittleren Infrarot
company
Mikro-integrierte Hochleistungs-Quellen für die Quantenkommunikation (MIHQU)
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
Spektrale Infrarot-Mikroskopie mit Quantenlicht zur mobilen Mikroplastik-Analyse
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
Spektrale Infrarot-Mikroskopie mit Quantenlicht zur mobilen Mikroplastik-Analyse
company
Spektrale Infrarot-Mikroskopie mit Quantenlicht zur mobilen Mikroplastik-Analyse
company
Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
- Name
- Dr. Sven Ramelow
- Titel
- Dr.
- Fakultät
- Mathematisch-Naturwissenschaftliche Fakultät
- Institut
- Institut für Physik
- Arbeitsgruppe
- NWG Nichtlineare Quantenoptik
- Telefon
- +49 30 2093-82303
- HU-FIS-Profil
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- Zuletzt gescrapt
- 26.4.2026, 01:10:44