Open AccessSecurity of quantum secure direct communication based on Wyner's wiretap channel theory
Author(s) -
Wu Jiawei,
Lin Zaisheng,
Yin Liuguo,
Long GuiLu
Publication year - 2019
Publication title -
quantum engineering
Language(s) - English
Resource type - Journals
ISSN - 2577-0470
DOI - 10.1002/que2.26
Subject(s) - eavesdropping , secrecy , channel (broadcasting) , quantum key distribution , quantum entanglement , computer science , computer network , protocol (science) , quantum channel , topology (electrical circuits) , quantum , computer security , physics , quantum mechanics , mathematics , medicine , combinatorics , alternative medicine , pathology
Summary Quantum secure direct communication (QSDC) transmits secret messages directly over a quantum channel without the prior distribution of a key. Here, we apply Wyner's wiretap channel theory to analyze the security of QSDC protocols. The ideal protocol is treated as the main channel, and the effect of eavesdropping is treated as the wiretap channel. Entanglement‐based QSDC protocols are analyzed in detail at first. We calculated the channel capacity of the wiretap channel, and hence, the secrecy channel capacity of the protocol. The security of single‐photon–based QSDC protocols is studied through the equivalence between the entanglement‐based protocols and single‐photon–based protocols. We present a modified version of the single‐photon‐based DL04 protocol, which gives a higher secrecy capacity.