Paper Info
Title
Secret key distillation across a quantum wiretap channel under restricted eavesdropping.
Abstract
The theory of quantum cryptography aims to guarantee unconditional information-theoretic security against an omnipotent eavesdropper. In many practical scenarios, however, the assumption of an all-powerful adversary is excessive and can be relaxed considerably. In this paper we study secret key distillation across a lossy and noisy quantum wiretap channel between Alice and Bob, with a separately parameterized realistically lossy quantum channel to the eavesdropper Eve. We show that under such restricted eavesdropping, the key rates achievable can exceed the secret key distillation capacity against an unrestricted eavesdropper in the quantum wiretap channel. Further, we show upper bounds on the key rates based on the relative entropy of entanglement. This simple restricted eavesdropping model is widely applicable, e.g., to free-space quantum optical communication, where realistic collection of light by Eve is limited by the finite size of her optical aperture. Future work will include calculating bounds on the amount of light Eve can collect under various realistic scenarios.
Year
DOI
Venue
2019
10.1103/PHYSREVAPPLIED.14.024044
arXiv: Information Theory
DocType
Volume
Issue
Journal
abs/1903.03136
2
Citations 
PageRank 
References 
0
0.34
4
Authors
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