Comment on "Quantum dense key distribution" (4 pages)

Ivo Pietro Degiovanni

Ivo Pietro Degiovanni

Toung-Shang Wei, Chia‐Wei Tsai, Tzonelih Hwang

Antoni Wójcik

In this Comment we question the security of recently proposed by Degiovanni et al. [Phys. Rev. A 69 (2004) 032310] scheme of quantum dense key distribution.

Chrysoula Vlachou, Walter Krawec, Paulo Mateus +2 more

Ivo Pietro Degiovanni, Ivano Ruo Berchera, Stefania Castelletto +4 more

In this Reply we propose a modified security proof of the quantum dense key distribution protocol, detecting also the eavesdropping attack proposed by W\'ojcik in his Comment [W\'ojcik, Phys. Rev. A 71, 016301 (2005)].