Finite key effects in satellite quantum key distribution

CV-MDI quantum key distribution via satellite

In this work we analyze a measurement-deviceindependent (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 ...

Finite-key analysis for measurement-device-independent quantum key distribution.

Quantum key distribution promises unconditionally secure communications. However, as practical devices tend to deviate from their specifications, the security of some practical systems is no longer valid. In particular, an adversary can exploit imperfect detectors to learn a large part of the secret key, even though the security proof claims otherwise. Recently, a practical approach--measuremen...

Finite-key analysis for practical implementations of quantum key distribution

The lists of bits processed in quantum key distribution are necessarily of finite length. The need for finite-key unconditional security bounds was recognized long ago, but the theoretical tools have become available only very recently. We provide finite-key unconditional security bounds for two practical implementations of the Bennett–Brassard 1984 coding: prepareand-measure implementations wi...

Sifting problems in finite-size quantum key distribution Extended Abstract

Quantum key distribution (QKD) allows for unconditionally secure communication between two parties (Alice and Bob). A recent breakthrough in the theory of QKD is the treatment of finite-key scenarios, pioneered by Renner and collaborators (see [1], for example). This has made QKD theory practically relevant, since the asymptotic regime associated with infinitely many exchanged quantum signals i...

Quantum Key Distribution