High-dimensional single photon based quantum secure direct communication using time and phase mode degrees.

ABSTRACT: Quantum secure direct communication (QSDC) can guarantee security using the characteristics of quantum mechanics even when a message is directly transmitted through a quantum channel without using a secret key. However, the transmission rate of the QSDC is limited by the dead time of a single photon detector (SPD) as well as channel loss over the distance. To overcome this limited transmission rate, we propose a high-dimensional single photon-based QSDC protocol that applies two optical degrees of freedom: time and phase state. First, an N-dimensional time and phase state generation method that considers the dead time is proposed to minimize the measurement loss of a transmitted message. Second, among the two types of quantum states, the phase state with relatively low measurement efficien

SUBMITTER: Ahn B 

PROVIDER: S-EPMC10776589 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature