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A Quantum-Memory-Free Quantum Secure Direct Communication Protocol Based on Privacy Amplification of Coded Sequences
Shang-Jen Su, Shi-Yuan Wang, Matthieu R. Bloch·January 29, 2026
Quantum Physics
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Abstract
We develop an information-theoretic analysis of Quantum-Memory-Free (QMF) Quantum Secure Direct Communication (QSDC) under collective attacks as an alternative to the conventional Quantum Key Distribution (QKD) protocol with one-time pads. Our main contributions are: 1) a QMF-QSDC protocol that only relies on universal hashing of coded sequences without wiretap coding; 2) a set of privacy amplification theorems for extracting secrecy from coded classical sequences against quantum side-information. These tools open the way to the design of robust QMF-QSDC protocols.