We study quantum secure direct communication using a general preshared quantum state
and a generalization of dense coding. In this scenario, Alice is allowed to apply a unitary …

We analyze physical-layer security based on the premise that the coding mechanism for
secrecy over noisy channels is tied to the notion of channel resolvability. Instead of …

Quantum networks will provide multinode entanglement enabling secure communication on
a global scale. Traditional quantum communication protocols consume pair-wise …

This paper investigates the maximal secret communication rate over a wiretap channel
subject to reliability and secrecy constraints at a given blocklength. New achievability and …

The Rényi entropy of general order unifies the well-known Shannon entropy with several
other entropy notions, like the min-entropy or collision entropy. In contrast to the Shannon …

Quantum digital signatures (QDSs), generating correlated bit strings among three remote
parties for signatures through quantum law, can guarantee nonrepudiation, authenticity, and …

Operationally accessible entanglement in bipartite systems of indistinguishable particles
could be reduced due to restrictions on the allowed local operations as a result of particle …

For indistinguishable itinerant particles subject to a superselection rule fixing their total
number, a portion of the entanglement entropy under a spatial bipartition of the ground state …

The renewed interest for physical-layer security techniques has put forward a new role for
error-control codes. In addition to ensuring reliability, carefully designed codes have been …

Common information is ubiquitous in information theory and related areas such as
theoretical computer science and discrete probability. However, because there are multiple …