# Free-Space Quantum Secure Direct Communication: Basics, Progress, and Outlook

> Research article (Advanced Devices & Instrumentation, 2023) · cited 68× · AI/ML

**Wikidata**: [openalex:W4321498089](https://www.wikidata.org/wiki/openalex:W4321498089)  
**Source**: https://4ort.xyz/entity/free-space-quantum-secure-direct-communication-basics-progress-and-outlook