Abstract: A method and a system for data transmission with mobile network nodes, which include at least two network interfaces with corresponding power consumption. A central unit is configured to receive data intended for the mobile network, and a first network interface of the mobile network node is deactivated. If the central unit receives data intended for themobile network node, a signaling message assigned to the received data is transmitted to the mobile network node, by a signaling module, via a second network interface of the mobile network node. Based on the transmitted signaling message, the first network interface of the mobile network node is activated, and data, which are intended for the mobile network node, are transmitted via the first network interface to the mobile network node.

Abstract: A method and a system for data transmission with mobile network nodes, which include at least two network interfaces with corresponding power consumption. A central unit is configured to receive data intended for the mobile network, and a first network interface of the mobile network node is deactivated. If the central unit receives data intended for the mobile network node, a signaling message assigned to the received data is transmitted to the mobile network node, by a signaling module, via a second network interface of the mobile network node. Based on the transmitted signaling message, the first network interface of the mobile network node is activated, and data, which are intended for the mobile network node, are transmitted via the first network interface to the mobile network node.

Abstract: A system and method for communicating a key between two stations using an interferometric system for quantum cryptography. The method includes sending at least two light pulses over a quantum channel and detecting the interference created by the light pulses. The interfering pulses traverse the same arms of an interferometer but in a different sequence such that the pulses are delayed when traversing a quantum channel. The pulses are reflected by Faraday mirrors at the ends of the quantum channel so as to cancel any polarization effects. Because the interfering pulses traverse the same arms of an interferometer, there is no need to align or balance between multiple arms of an interferometer.