Work

Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks

Year: 2021

Type: article

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.In this setting, we study the composable security in the finite-size regime assuming the realistic but restrictive hypothesis of collective Gaussian attacks.Under this assumption, we can efficiently estimate the parameters of the channel via maximum likelihood estimators and bound the corresponding error in the final secret key rate.

Source: Physical Review Research

DOI: 10.1103/physrevresearch.3.013047

Authors: Panagiotis Papanastasiou, Stefano Pirandola

Institution: University of York

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: European Commission, Engineering and Physical Sciences Research Council