Thomas Scheidl
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View article: Quantum communication networks with defects in silicon carbide
Quantum communication networks with defects in silicon carbide Open
Quantum communication promises unprecedented communication capabilities enabled by the transmission of quantum states of light. However, current implementations face severe limitations in communication distance due to photon loss. Silicon …
View article: Fully passive entanglement based quantum key distribution scheme
Fully passive entanglement based quantum key distribution scheme Open
In general, generation of entangled photon pairs and also the random choice of measurement basis can be implemented with passive optical devices in entanglement based quantum key distribution (QKD) system. However, auxiliary random numbers…
View article: Model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources
Model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources Open
Quantum Key Distribution (QKD) allows unconditionally secure communication\nbased on the laws of quantum mechanics rather then assumptions about\ncomputational hardness. Optimizing the operation parameters of a given QKD\nimplementation is…
View article: How to choose the best QKD network technology: three different satellite based scenarios compared
How to choose the best QKD network technology: three different satellite based scenarios compared Open
Quantum cryptography promises unconditionally secure communication. Today, there exists a vast array of different QKD protocols that claim to offer security. However, looking in more detail, many subtleties lead to different security level…
View article: Verification of high-dimensional entanglement generated in quantum interference
Verification of high-dimensional entanglement generated in quantum interference Open
Entanglement and quantum interference are key ingredients in a variety of\nquantum information processing tasks. Harnessing the generation and\ncharacterization of entanglement in high-dimensional state spaces is a\nnecessary prerequisite …
View article: Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre
Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre Open
Quantum key distribution (QKD) based on entangled photon pairs holds the potential for repeater-based quantum networks connecting clients over long distance. We demonstrate long-distance entanglement distribution by means of polarisation-e…
View article: Certification of high-dimensional entanglement generated in Hong-Ou-Mandel interference
Certification of high-dimensional entanglement generated in Hong-Ou-Mandel interference Open
Entanglement and quantum interference are key ingredients in a variety of quantum information processing tasks. Harnessing the generation and characterization of entanglement in high-dimensional state spaces is a necessary prerequisite tow…
View article: Achieving unprecedented high secure key rates over a representative satellite link
Achieving unprecedented high secure key rates over a representative satellite link Open
Quantum key distribution (QKD) is a pioneering quantum technology on the brink of widespread deployment. Nevertheless, the distribution of secret keys beyond a few 100 kilometers at practical rates remains a major challenge. One approach t…
View article: Feasibility of a 3U CubeSat for uplink quantum communications
Feasibility of a 3U CubeSat for uplink quantum communications Open
In the absence of technically mature quantum repeaters, losses in optical fibers limit the distance for ground-bound quantum key distribution (QKD). One way to overcome these losses is via optical links to satellites, which has most promin…
View article: Entanglement-enhanced optical gyroscope
Entanglement-enhanced optical gyroscope Open
Fiber optic gyroscopes (FOG) based on the Sagnac effect are a valuable tool in sensing and navigation and enable accurate measurements in applications ranging from spacecraft and aircraft to self-driving vehicles such as autonomous cars. A…
View article: Entanglement distribution over a 96-km-long submarine optical fiber
Entanglement distribution over a 96-km-long submarine optical fiber Open
Significance Entanglement, the existence of correlations in distant systems stronger than those allowed by classical physics, is one of the most astonishing features of quantum physics. By distributing entangled photon pairs over a 96-km-l…
View article: Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars
Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars Open
In this Letter, we present a cosmic Bell experiment with polarization-entangled photons, in which measurement settings were determined based on real-time measurements of the wavelength of photons from high-redshift quasars, whose light was…
View article: Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design
Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design Open
Satellites are the most efficient way to achieve global scale quantum communication (Q.Com) because unavoidable losses restrict fiber based Q.Com to a few hundred kilometers. We demonstrate the feasibility of establishing a Q.Com uplink wi…
View article: Satellite-Relayed Intercontinental Quantum Network
Satellite-Relayed Intercontinental Quantum Network Open
We perform decoy-state quantum key distribution between a low-Earth-orbit satellite and multiple ground stations located in Xinglong, Nanshan, and Graz, which establish satellite-to-ground secure keys with ∼kHz rate per passage of the sate…
View article: QIPS: quantum information and quantum physics in space
QIPS: quantum information and quantum physics in space Open
The aim of the QIPS project (financed by ESA) is to explore quantum phenomena and to demonstrate quantum communication over long distances. Based on the current state-of-the-art a first study investigating the feasibility of space based qu…
View article: Cosmic Bell Test: Measurement Settings from Milky Way Stars
Cosmic Bell Test: Measurement Settings from Milky Way Stars Open
Bell's theorem states that some predictions of quantum mechanics cannot be reproduced by a local-realist theory. That conflict is expressed by Bell's inequality, which is usually derived under the assumption that there are no statistical c…
View article: Distribution of high-dimensional entanglement via an intra-city free-space link
Distribution of high-dimensional entanglement via an intra-city free-space link Open
Quantum entanglement is a fundamental resource in quantum information processing and its distribution between distant parties is a key challenge in quantum communications. Increasing the dimensionality of entanglement has been shown to imp…
View article: A Cosmic Bell Test with Measurement Settings from Astronomical Sources
A Cosmic Bell Test with Measurement Settings from Astronomical Sources Open
Bell's theorem states that some predictions of mechanics cannot be reproduced by a local-realist theory. That conflict is expressed by Bell's inequality, which is usually derived under the assumption that there are no statistical correlat…
View article: Experimental test of photonic entanglement in accelerated reference frames
Experimental test of photonic entanglement in accelerated reference frames Open
The quantization of the electromagnetic field has successfully paved the way for the development of the Standard Model of Particle Physics and has established the basis for quantum technologies. Gravity, however, continues to hold out agai…