Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks
Panagiotis Papanastasiou, Stefano Pirandola
Abstract
We consider continuous-variable quantum key distribution with discrete-alphabet encodings. In particular, we study protocols where information is encoded in the phase of displaced coherent (or thermal) states, even though the results can be directly extended to any protocol based on finite constellations of displaced Gaussian states.
Topics & Concepts
Quantum key distributionComputer scienceQuantum cryptographyTheoretical computer scienceProtocol (science)GaussianCryptographyKey (lock)QuantumCryptographic protocolMathematicsQuantum informationTopology (electrical circuits)Quantum channelAlgorithmQuantum networkInformation-theoretic securityQuantum entanglementQuantum computerComputer networkDiscrete mathematicsBB84QubitDiscrete logarithmPublic-key cryptographySecurity analysisPhase (matter)Encoding (memory)Quantum Information and CryptographyQuantum Mechanics and ApplicationsQuantum Computing Algorithms and Architecture