2 research outputs found
Eurasian-Scale Experimental Satellite-based Quantum Key Distribution with Detector Efficiency Mismatch Analysis
The Micius satellite is the pioneering initiative to demonstrate quantum
teleportation, entanglement distribution, quantum key distribution (QKD), and
quantum-secured communications experiments at the global scale. In this work,
we report on the results of the 600-mm-aperture ground station design which has
enabled the establishment of a quantum-secured link between the Zvenigorod and
Nanshan ground stations using the Micius satellite. As a result of a quantum
communications session, an overall sifted key of 2.5 Mbits and a total final
key length of 310 kbits have been obtained. We present an extension of the
security analysis of the realization of satellite-based QKD decoy-state
protocol by taking into account the effect of the detection-efficiency mismatch
for four detectors. We also simulate the QKD protocol for the satellite passage
and by that validate our semi-empirical model for a realistic receiver, which
is in good agreement with the experimental data. Our results pave the way to
the considerations of realistic imperfection of the QKD systems, which are
important in the context of their practical security.Comment: 8+2 pages, 5+2 figure
Semi-Empirical Satellite-to-Ground Quantum Key Distribution Model for Realistic Receivers
Satellite-based link analysis is valuable for efficient and secure quantum communication, despite seasonal limits and restrictions on transmission times. A semi-empirical quantum key distribution model for satellite-based systems was proposed that simplifies simulations of communication links. Unlike other theoretical models, our approach was based on the experimentally-determined atmospheric extinction coefficient typical for mid-latitude ground stations. The parameter was measured for both clear and foggy conditions, and it was validated using published experimental data from the Micius satellite. Using this model, we simulated secure QKD between the Micius satellite and ground stations with 300 mm and 600 mm aperture telescopes