Quantum Cryptography via Satellite

Quantum Cryptography via Parametric Downconversion

The use of quantum bits (qubits) in cryptography holds the promise of secure cryptographic quantum key distribution schemes. It is based usually on single-photon polarization states. Unfortunately, the implemented “qubits” in the usual weak pulse experiments are not true two-level systems, and quantum key distribution based on these imperfect qubits is totally insecure in the presence of high (...

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 ...

Network Architectures for Space-Optical Quantum Cryptography Services Introduction of Quantum Communications in Satellite Communication Networks

Quantum cryptography enables the distribution of ‘information-theoretically’ secure (ITS) keys, whose secrecy is guaranteed by the laws of quantum physics. Such a level of security is superior to conventional ‘classical’ cryptography whose security is at most ‘computational’, and even this lower security level is unverified in many cases. Fiber-based quantum key distribution (QKD) systems for l...

Quantum Cryptography

Quantum cryptography

This is a chapter on quantum cryptography for the book “A Multidisciplinary Introduction to Information Security” to be published by CRC Press in 2011/2012. The chapter aims to introduce the topic to undergraduate-level and continuing-education students specializing in information and communication technology.