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We demonstrate how adversaries with large 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...
A virtually passive ROADM for dynamic spectrum allocation and lightpath provisioning among drop ports is experimentally demonstrated. Passiveness is granted by means of energy harvesting at a low optical feed level of −9 dBm.
The rapid progress of QKD in theory and experiment has been reflected by a number of successful demonstrations during the last years. Many groups all over the world have put forward QKD-links, operating in the standard point-to-point mode. However, broad proliferation of QKD systems is slowed down by a number of road blocks: the point-to-point paradigm and correspondingly the quadratic scaling of...
Quantum cryptography or more specifically quantum key distribution (QKD) is the most advanced quantum information protocol. We present here an entanglement-based QKD system designed to work at 1550 nm for optimal distribution in optical fibers using the BBM92 protocol. Our QKD system is realised as a compact device. The start-up and alignment is fully automated and stabilisation routines guarantee...
The very recent demonstration of the SECOQC QKD-network convincingly extended single QKD-links to QKD-networks gaining new functionalities. The needed interfaces, protocols and node modules are explained.
We present a prototypic Quantum Key Distribution (QKD) back-bone network, formed by seven QKD-Link devices that connect five subsidiaries of SIEMENS Austria. This highly integrated trusted-repeater type QKD network allows integration of heterogeneous QKD technologies.
We present a fully operable security gateway prototype, integrating quantum key distribution and realised as a system-on-chip. It is implemented on a field-programmable gate array and provides a virtual private network with low latency and gigabit throughput. The seamless hard- and software integration of a quantum key distribution layer enables high key-update rates for the encryption modules. Hence,...
Quantum key distribution (QKD) is on the brink of being deployed on a large scale. For a successful launch it is important though, that QKD devices can be incorporated into or use existing telecom networks. Although not at telecom wavelengths, QKD based on polarization entanglement has already been shown over 1.4 km outside the laboratory. However, it was thought that dispersion effects, mainly polarization...
It is well-known that multi-photon signals in quantum key distribution (QKD) with weak laser pulses represent a security threat resulting in a reduced rate for secret-key production. Similarly, multi-pair contributions from spontaneous-parametric-down-conversion (SPDC) sources may cause information leak. In particular, in the case of polarization coding (i.e., when the polarization of photons is used...
This paper presents a slide presentation on entanglement based quantum key distribution (QKD). It first introduced entanglement then discussed the BBM92 protocol for quantum cryptography using entangled states. Then a demonstration of QKD outside the laboratory using entangled photons. A new type of entangled source for long distance QKD is also presented.
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