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检索条件"机构=Fraunhofer-Institute for Applied Optics and Precision Engineering IOF"

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Robust Time Transfer with Single Photons on Hybrid Quantum Communication Scenarios in Fiber and Free-Space

Robust Time Transfer with Single Photons on Hybrid Quantum C...

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Christopher Spiess Karolina Pacicrek Nico Lennart Doll Andrej Krzic Fabian Steinlechner Friedrich Schiller University Jena Jena Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena

ISBN: (纸本)9798350345995

Quantum communication networks exploit single photons to generate secure encryption keys and can have very tight timing requirements [1]. These synchronization requirements are met through highly stable references, but there is ongoing research on using only single photons to enable synchronization [2]–[4]. The single photons come naturally with the quantum communication protocol and motivate its use for both data and time transfer. As point-to-point quantum communication scenarios rapidly expand to large networks, there is great demand for robust and resource-saving synchronization methods. In this contribution, we show that single photons can be indeed a solid carrier of timing information. We complement other publications [2], [5] by describing the performance of the synchronization approach and evaluating it on a 1.7 km free space and a 70 km deployed intercity fiber link. We demonstrate time deviations of 100 ps (1.7 km free-space link) and 174 ps (70 km fiber-link) at integration times of 1 second with only crystal oscillators, which is slightly larger than 54 ps in a lab environment (Fig. 1(a)). Our results provide advances towards a strong, independent, and secure quantum communication network without external hardware and a reliable operation under versatile link scenarios.

关键词： Fiber optic communications Quantum communications Quantum key distribution Quantum light sources Single mode fibers Spatial filtering

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Non-degenerate correlated SPDC photon source for UV-A illumination

Non-degenerate correlated SPDC photon source for UV-A illumi...

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Goswami, Preetisha Basset, Marta Gilaberte Fuenzalida, Jorge Gräfe, Markus Gili, Valerio Flavio Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Friedrich-Schiller-University Jena Institute of Applied Physics Abbe Centre of Photonics Albert-Einstein-Str. 6 Jena07745 Germany Institute of Applied Physics Technical University of Darmstadt Schloßgartenstraße 7 Darmstadt64289 Germany

We present a correlated photon source consisting of a BBO nonlinear crystal that generates ultraviolet UV-A and infrared light via SPDC. Quantum imaging and sensing techniques can benefit from the correlations between... 详细信息

ISBN: (纸本)9781557525185

关键词： Nonlinear optics

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engineering of Spectral Correlations of the Two-Photon State in Parametric Down-Conversion via Spatial Mode Projection

Engineering of Spectral Correlations of the Two-Photon State...

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Optica Quantum 2.0 Conference and Exhibition, Quantum 2.0

作者： Sevilla-Gutiérrez, Carlos Kaipalath, Varun Raj Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Str. 6 Jena07745 Germany

We report an innovative method to shape the spectral properties of the two-photons state in parametric down-conversion by exploiting the spatial-spectral correlations in terms of the spectral dependence of the Laguerr... 详细信息

ISBN: (纸本)9781957171272

关键词： Parametric down conversion Quantum computation Quantum information Quantum key distribution Quantum light sources Spectral properties

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Compact cross-grating spectrometer in double-pass configuration: design, implementation, and test 15

Compact cross-grating spectrometer in double-pass configurat...

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Next-Generation Spectroscopic Technologies XV 2023

作者： Kraus, Matthias Hönle, Tobias Förster, Erik Brüning, Robert Hillmer, Hartmut Brunner, Robert University of Applied Sciences Jena Carl-Zeiss-Promenade 2 Jena Germany University of Kassel Heinrich-Plett-Straße 40 Kassel Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 Jena Germany

ISBN: (数字)9781510661479

ISBN: (纸本)9781510661462

Echelle-inspired cross-grating spectrometers try to combine the high performance of classical Echelle spectrometers and the small footprint of compact line-grating spectrometers. Therefore, a cross-grating is used which is a superposition of two perpendicularly oriented line gratings in a single element. Highly resolved, but overlapping, diffractions orders are created by the main grating, which are separated by the cross-disperser. This powerful approach is connected to different challenges concerning the optical design, the fabrication of the cross-grating and implementation of the device. These challenges are addressed by a compact and rigid double-pass design, which utilizes the same refractive elements for collimation of the incoming beam and focusing of the diffracted light on the detector. This contribution gives an overview on the design and focusses on the implementation of the spectrometer. This includes on one hand the mounting of the cross-grating and the refractive elements in a rigid objective group and, on the other hand, the adjustment of the objective to the entrance fiber and the 2D detector. Furthermore, the implemented and calibrated instrument allows to conduct several validating experimental tests in order to proof the working principle. The spectrometer addresses a spectral range from 400 nm to 1100 nm and reaches a resolving power of 300 with an entrance pinhole diameter of 105 µm. An even higher resolving power of more than 1000 is reached with a reduced pinhole diameter of approximately 5 µm. © 2023 SPIE.

关键词： Diffraction gratings

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engineering Spectral Purity of Telecom Wavelength Photons Generated via SPDC for Multi-partite Quantum Communication

Engineering Spectral Purity of Telecom Wavelength Photons Ge...

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Conrad, Johanna Gómez, Rodrigo Leipe, Markus Ponce, Meritxell Cabrejo Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena07745 Germany Institute of Applied Physics Friedrich Schiller University Jena Albert-Einstein-Strasse 15 Jena07745 Germany

We report on engineering spectrally pure photon pairs via SPDC and provide a comprehensive characterization of periodically and aperiodically poled KTP crystals as well as Hong-Ou-Mandel experiments between photons pr... 详细信息

ISBN: (纸本)9781557525185

关键词： Quantum communication

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Low-loss lithium niobate integrated photonic devices fabricated on wafer-scale

Low-loss lithium niobate integrated photonic devices fabrica...

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2024 Conference on Lasers and Electro-optics/Pacific Rim, CLEO-PR 2024

作者： Geiss, Reinhard Younesi, Mohammadreza Mühlenstädt, Johannes Käsebier, Thomas Setzpfandt, Frank Siefke, Thomas Pertsch, Thomas Eilenberger, Falk Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Strasse 7 Jena07745 Germany Institute of Applied Physics Friedrich-Schiller-Universität Jena Albert-Einstein-Strasse 15 Jena07745 Germany

Lithium niobate is a popular material in integrated photonics due to its optical and electro-optic properties. It is used in low-loss waveguides for high-speed and high integration density photonic devices. This technology enables integration of various devices on a single chip for quantum technology and telecom applications. Here, we present waveguide devices such as modulators, micro-ring resonators and frequency converters having losses below 0.05 dB/cm. The challenges of wafer-scale fabrication will be discussed. © 2024 The Author(s)

关键词： Photonic integrated circuits

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Pattern projection using arbitrary shaped microlenses and intentional crosstalk

Pattern projection using arbitrary shaped microlenses and in...

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Microopics Conference (MOC)

作者： Rohan Kundu Dirk Michaelis Peter Schreiber Phillip Schleicher Anja Schöneberg Robert Leitel Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena Germany

A tandem microlens array with arbitrary shaped lenslets projects patterns towards the far-field. Employing intentional channel crosstalk enables dynamic steering of the projected pattern. The micro-optics is mastered ...

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Nanostructured Back Surface Amorphization of Silicon with Picosecond Infrared Laser Pulses

Nanostructured Back Surface Amorphization of Silicon with Pi...

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2023 Conference on Lasers and Electro-optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Blothe, Markus Chambonneau, Maxime Nolte, Stefan Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Straße 7 Jena07745 Germany

ISBN: (纸本)9798350345995

Silicon, the backbone material of the electronics industry, shows vastly different properties in the amorphous (a-Si) and the crystalline (c-Si) state. Traditional techniques for producing a-Si show drawbacks as the need for a hot environment or permanently induced impurities. Laser-based silicon amorphization enables a precise and contactless production of an a-Si surface layer. The locally induced state change on a micrometer scale enable a mask-less wet etching process and the inscription of surface waveguides. Currently, this process is only applicable to the front surface [1]. If one attempts to simply transpose this technique to the back surface, the propagation of Gaussian-shaped intense pulses in silicon leads to the formation of micro-filaments due to the low critical power for self-focusing (≈10-20 kW). Consequently, typical filamentation features such as nonlinear focal shift as well as intensity clamping occur simultaneously. These mechanisms hinder energy deposition in a confined volume in the bulk and the back surface of silicon [2,3]. © 2023 IEEE.

关键词： Amorphization

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Inscription and Characterization of Transversely Written Waveguides in Silicon with Picosecond Laser Pulses

Inscription and Characterization of Transversely Written Wav...

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2023 Conference on Lasers and Electro-optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Blothe, Markus Chambonneau, Maxime Alberucci, Alessandro Alasgarzade, Namig Nolte, Stefan Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Straße 7 Jena07745 Germany

ISBN: (纸本)9798350345995

The possibility to permanently modify transparent materials and inscribe waveguiding structures with ultrashort laser pulses is well established for dielectrics such as glasses. Such a technique discloses a versatile set of applications, ranging from telecommunications to photonic quantum circuits. Attempts to transfer this 3D ultrafast inscription technique to the most important material in the microelectronics industry, silicon, failed so far for a transverse inscription strategy. © 2023 IEEE.

关键词： Silicon

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Characterization of femtosecond laser-written waveguides in silicon

Characterization of femtosecond laser-written waveguides in ...

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2023 Conference on Lasers and Electro-optics, CLEO 2023

作者： Alasgarzade, Namig Alberucci, Alessandro Blothe, Markus Chambonneau, Maxime Jisha, Chandroth P. Nolte, Stefan Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universitat Jena Albert-Einstein-Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Straβe 7 Jena07745 Germany

ISBN: (纸本)9781957171258

We characterize laser-written waveguides in silicon versus the inscription parameters such as scanning speed and pulse energy. The analysis is carried out at different wavelengths and polarization states. Finally, the silicon sample is annealed to investigate the possible mechanism that leads to positive refractive index changes. © 2023 The Author(s)

关键词： Silicon

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