WorldCat Identities

Ursin, Rupert

Works: 13 works in 16 publications in 1 language and 79 library holdings
Roles: Other, Contributor, opp, dgs, Author
Publication Timeline
Most widely held works by Rupert Ursin
Optics in our time by Muhammad Suhail Zubairy( Book )

2 editions published in 2016 in English and held by 59 WorldCat member libraries worldwide

Light and light based technologies have played an important role in transforming our lives via scientific contributions spanned over thousands of years. In this book we present a vast collection of articles on various aspects of light and its applications in the contemporary world at a popular or semi-popular level. These articles are written by the world authorities in their respective fields. This is therefore a rare volume where the world experts have come together to present the developments in this most important field of science in an almost pedagogical manner. This volume covers five aspects related to light. The first presents two articles, one on the history of the nature of light, and the other on the scientific achievements of Ibn-Haitham (Alhazen), who is broadly considered the father of modern optics. These are then followed by an article on ultrafast phenomena and the invisible world. The third part includes papers on specific sources of light, the discoveries of which have revolutionized optical technologies in our lifetime. They discuss the nature and the characteristics of lasers, Solid-state lighting based on the Light Emitting Diode (LED) technology, and finally modern electron optics and its relationship to the Muslim golden age in science. The book's fourth part discusses various applications of optics and light in today's world, including biophotonics, art, optical communication, nanotechnology, the eye as an optical instrument, remote sensing, and optics in medicine. In turn, the last part focuses on quantum optics, a modern field that grew out of the interaction of light and matter. Topics addressed include atom optics, slow, stored and stationary light, optical tests of the foundation of physics, quantum mechanical properties of light fields carrying orbital angular momentum, quantum communication, and Wave-Particle dualism in action
Adaptive optics for free-space communication with entangled orbital angular momentum photons by Nina Leonhard( )

2 editions published in 2019 in English and held by 3 WorldCat member libraries worldwide

Quantum key distribution is a promising candidate to ensure secure communication in the future. Higher-dimensional state spaces as provided by the orbital angular momentum of photons (OAM) could further improve the security and robustness to noise. When transmitted through free-space, these photons experience atmospheric turbulence which introduces distortions to the encoded OAM. A technologoy called adaptive optics has been developed in astronomy to counter-act turbulence-induced distortion. While the application of adaptive optics has been considered in the context of classical OAM communication, this thesis presents the first results for OAM-based quantum key distribution. The main result of this thesis is that the losses of the quantum mechanical properties of OAM photons in atmospheric can be mitigated by adaptive optics. Both the entanglement and the trace of the final state's density matrix can be significantly improved. Furthermore, the security of the quantum key distribution protocol can be ensured for two to three times stronger turbulence as measured by the Fried parameter. The presented results demonstrate the great potential of adaptive optics for OAM quantum cryptography
Macroscopic Quantum Resonators (MAQRO): 2015 update by Rainer Kaltenbaek( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

CubeSat quantum communications mission by Daniel KL Oi( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Nanobob: a CubeSat mission concept for quantum communication experiments in an uplink configuration by CSUG Team( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Comparative study of afterpulsing behavior and models in single photon counting avalanche photo diode detectors by Abdul Waris Ziarkash( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

An entanglement-based wavelength-multiplexed quantum communication network by Sören Wengerowsky( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Q3Sat: quantum communications uplink to a 3U CubeSat--feasibility & design by Sebastian Philipp Neumann( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Quantum teleportation across the Danube by Rupert Ursin( )

2 editions published in 2004 in English and held by 1 WorldCat member library worldwide

Attacks on quantum key distribution protocols that employ non-ITS authentication by Christoph Pacher( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

We demonstrate how adversaries with unbounded computing resources can break Quantum Key Distribution (QKD) protocols which employ a particular message authentication code suggested previously. This authentication code, featuring low key consumption, is not Information-Theoretically Secure (ITS) since for each message the eavesdropper has intercepted she is able to send a different message from a set of messages that she can calculate by finding collisions of a cryptographic hash function. However, when this authentication code was introduced it was shown to prevent straightforward Man-In-The-Middle (MITM) attacks against QKD protocols. In this paper, we prove that the set of messages that collide with any given message under this authentication code contains with high probability a message that has small Hamming distance to any other given message. Based on this fact we present extended MITM attacks against different versions of BB84 QKD protocols using the addressed authentication code; for three protocols we describe every single action taken by the adversary. For all protocols the adversary can obtain complete knowledge of the key, and for most protocols her success probability in doing so approaches unity. Since the attacks work against all authentication methods which allow to calculate colliding messages, the underlying building blocks of the presented attacks expose the potential pitfalls arising as a consequence of non-ITS authentication in QKDpostprocessing. We propose countermeasures, increasing the eavesdroppers demand for computational power, and also prove necessary and sufficient conditions for upgrading the discussed authentication code to the ITS level
Bell-inequality violation with entangled photons, free of the coincidence-time loophole by Jan-Åke Larsson( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

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
Multiparty Quantum Communication and fs-laser Written Integrated Optics Circuits by Ashraf Mohamed El Hassan( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Quantum information science, the rapidly developing interdisciplinary field, gives power to the information and communications technologies (ICT) by providing secure communication, precision measurements, ultra-powerful simulation and ultimately computation. It is well known that photons are an ideal candidate for encoding the quantum bit, or "qubit", in quantum information and specially for quantum communication. This thesis consists of two main parts. In the first part, realization of quantum security tasks using optical fibers has been implemented. Bell tests are a cornerstone of quantum key distribution and are necessary for device-independent security. Device-independent Bell inequality test must be performed with care to avoid loopholes. Time-energy entanglement has a distinct advantage over polarization as it is easier transmitted over longer distances, therefore, it may be preferable as a quantum resource to perform reliable key distribution. Novel multi-party communication protocols: secret sharing, detectable Byzantine agreement, clock synchronization, and reduction of communication complexity, all these quantum protocols has been realized without compromising on detection efficiency or generating extremely complex many-particle entangled states. These protocols are realized in an optical fiber setup with sequential phase modulation on single photons. In recent years there has been great interest in fabricating ICT optical setups in low scale in glass chips, which would replace the bulk setups on tables used today. In the second part of the thesis, realization of photonic waveguides in glass has been implemented. Using femtosecond laser inscription of waveguides in glass, photonic quantum technologies and integrated optical circuits are becoming more and more important in miniaturization of optical circuits written in different glass samples for the quantum optics and quantum information processing. These platforms offer stability over the time-scales required for multi-photon coincidence based measurements. The study and optimization the different building blocks for integrated photonic quantum circuits, for instance the directional coupler and Mach-Zehnder interferometer is very important. The principal goal is to develop a method for design, fabrication and characterization of integrated optics circuits for further applications in quantum information. Incorporation of photon sources, detectors, and circuits integrating waveguides technology can be used to produce integrated photonics devices
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Audience level: 0.65 (from 0.54 for Optics in ... to 0.97 for Optics in ...)

Optics in our time
Alternative Names
Rupert Ursin Austrian physicist

Rupert Ursin físic austríac

Rupert Ursin físico austríaco

Rupert Ursin físicu austriacu

Rupert Ursin fizikan austriak

Rupert Ursin natuurkundige uit Oostenrijk

Rupert Ursin österreichischer Physiker

Rupert Ursin physicien autrichien

Ursin, R. 1973-

English (16)