High-speed phase-encoded quantum secure direct communication over 11.4 km heterogeneous free-space and fiber links
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866910014185144320 |
|---|---|
| author | Sun, Ze-Zhou Cheng, Yuan-Bin Liu, Yu-Chen Guo, Jianxing Song, Xiao-Tian Zhang, Wei Pan, Dong long, Gui-Lu |
| author_facet | Sun, Ze-Zhou Cheng, Yuan-Bin Liu, Yu-Chen Guo, Jianxing Song, Xiao-Tian Zhang, Wei Pan, Dong long, Gui-Lu |
| contents | Robust quantum transmission is driving a new paradigm in space-ground quantum networking. Although phase encoding has been widely adopted in terrestrial fiber channels, it has long been considered unsuitable for free-space quantum communication. Here, we demonstrate phase-encoded quantum communication over 1400 m of urban free space. The system maintained stable operation for nearly one hour, achieving 99.07% interference visibility and an average quantum bit error rate of 2.38%. The free-space quantum states were directly coupled into the fiber and transmitted over an additional 10 km, confirming seamless interoperability across different media. We further show that turbulence-induced phase drifts between successive picosecond pulses can be effectively compensated. A cascaded-link model and numerical simulations indicate feasibility over free-space distances exceeding 30 km, underscoring the potential for satellite-to-ground quantum links. This work establishes the viability of phase encoding in free-space quantum networks, simplifying cross-medium integration and enabling compatibility with existing classical infrastructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_06624 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-speed phase-encoded quantum secure direct communication over 11.4 km heterogeneous free-space and fiber links Sun, Ze-Zhou Cheng, Yuan-Bin Liu, Yu-Chen Guo, Jianxing Song, Xiao-Tian Zhang, Wei Pan, Dong long, Gui-Lu Quantum Physics Robust quantum transmission is driving a new paradigm in space-ground quantum networking. Although phase encoding has been widely adopted in terrestrial fiber channels, it has long been considered unsuitable for free-space quantum communication. Here, we demonstrate phase-encoded quantum communication over 1400 m of urban free space. The system maintained stable operation for nearly one hour, achieving 99.07% interference visibility and an average quantum bit error rate of 2.38%. The free-space quantum states were directly coupled into the fiber and transmitted over an additional 10 km, confirming seamless interoperability across different media. We further show that turbulence-induced phase drifts between successive picosecond pulses can be effectively compensated. A cascaded-link model and numerical simulations indicate feasibility over free-space distances exceeding 30 km, underscoring the potential for satellite-to-ground quantum links. This work establishes the viability of phase encoding in free-space quantum networks, simplifying cross-medium integration and enabling compatibility with existing classical infrastructures. |
| title | High-speed phase-encoded quantum secure direct communication over 11.4 km heterogeneous free-space and fiber links |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.06624 |