CV-MDI Quantum Key Distribution via Satellite
Nedasadat Hosseinidehaj, Robert Malaney

TL;DR
This paper analyzes a satellite-based measurement-device-independent continuous-variable quantum key distribution protocol, demonstrating its potential to generate positive key rates over high-loss atmospheric channels even with untrusted satellites.
Contribution
It introduces a novel MDI CV-QKD protocol via satellite, analyzing security and key rates over atmospheric-fading channels with an untrusted relay satellite.
Findings
Positive key rates achievable over high-loss channels
Fading channels can enhance key rates under certain conditions
Untrusted satellite relays still enable secure key generation
Abstract
In this work we analyze a measurement-device-independent (MDI) protocol to establish continuous-variable (CV) quantum key distribution (QKD) between two ground stations. We assume communication occurs between the ground stations via satellite over two independent atmospheric-fading channels dominated by turbulence-induced beam wander. In this MDI protocol the measurement device is the satellite itself, and the security of the protocol is analyzed through an equivalent entanglement-based swapping scheme. We quantify the positive impact the fading channels can have on the final quantum key rates, demonstrating how the protocol is able to generate a positive key rate even over high-loss atmospheric channels. This is somewhat counter-intuitive given that the same outcome is only possible in the low-loss regime for a measurement device centrally positioned in a fiber-optic channel. Our…
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