Paper Info
Title
Secret Key Distillation Over A Pure Loss Quantum Wiretap Channel Under Restricted Eavesdropping
Abstract
Quantum cryptography provides absolute security against an all-powerful eavesdropper (Eve). However, in practice Eve's resources may be restricted to a limited aperture size so that she cannot collect all paraxial light without alerting the communicating parties (Alice and Bob). In this paper we study a quantum wiretap channel in which the connection from Alice to Eve is lossy, so that some of the transmitted quantum information is inaccessible to both Bob and Eve. For a pure-loss channel under such restricted eavesdropping, we show that the key rates achievable with a two-mode squeezed vacuum state, heterodyne detection, and public classical communication assistance-given by the Hashing inequality-can exceed the secret key distillation capacity of the channel against an omnipotent eavesdropper. We report upper bounds on the key rates under the restricted eavesdropping model based on the relative entropy of entanglement, which closely match the achievable rates. For the pure-loss channel under restricted eavesdropping, we compare the secret-key rates of continuous-variable (CV) quantum key distribution (QKD) based on Gaussian-modulated coherent states and heterodyne detection with the discrete variable (DV) decoystate BB84 QKD protocol based on polarization qubits encoded in weak coherent laser pulses.
Year
DOI
Venue
2019
10.1109/ISIT.2019.8849223
2019 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT)
Field
DocType
Citations 
Quantum key distribution,Discrete mathematics,Topology,Alice and Bob,Eavesdropping,Quantum entanglement,Computer science,Quantum cryptography,BB84,Quantum information,Qubit
Conference
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
Ziwen Pan100.68
Kaushik Seshadreesan2213.94
William Clark300.68
Mark R. Adcock400.68
Ivan B. Djordjevic500.68
Jeffrey H. Shapiro615322.84
Saikat Guha71546116.91