Statistics

Mathematical analysis

Gaussian network model

Quantum information

Realization (probability)

Telecommunications

Quantum

Combinatorics

Physics

Channel (broadcasting)

Bitstream

Topology (electrical circuits)

Quantum channel

Mathematics

Acoustics

Quantum mechanics

Computer science

Quantum key distribution

Algorithm

Modulation (music)

Gaussian

Scheme (mathematics)

Theoretical computer science

Pathology

Protocol (science)

Computer network

Transmission (telecommunications)

Alternative medicine

Decoding methods

Medicine

Physical Review Applied

Quantum secure direct communication (QSDC) realizes the transmission of secret messages directly in a quantum channel. A continuous-variable- (CV) based quantum-communication system allows high-speed, large-capacity information transmission in optical telecommunication systems. In this work, we propose a QSDC protocol based on Gaussian mapping. As for Gaussian modulation, the designed Gaussian-mapping scheme effectively solves the problem, which results from the nonuniformity of the secret-message bitstream, and is applicable to different modulation variances. The system performance analysis shows that the proposed scheme can realize inerrant Gaussian modulation of secret messages, and secure transmission of messages under information theory. Moreover, our work hopes to stimulate discussion on experimental realization and practical advance of CV-QSDC protocol.

Continuous-Variable Quantum Secure Direct Communication Based on Gaussian Mapping