Multiuser all-optical quantum network based on metasurfaces

Area of Science:

• Quantum Information Science
• Optical Metasurfaces
• Quantum Networking

Background:

• Establishing large-scale multiuser quantum networks is essential for secure information transmission.
• Current challenges include the need for massive and compact Einstein-Podolsky-Rosen (EPR) entangled states.
• Continuous-variable (CV) quantum networks offer a promising avenue for quantum communication.

Purpose of the Study:

• To experimentally generate a compact, large-scale continuous-variable (CV) Einstein-Podolsky-Rosen (EPR) entanglement array.
• To establish the largest all-optical quantum state sharing (AOQSS) network in the CV regime.
• To demonstrate a novel metasurface-based approach for generating CV EPR entanglement.

Main Methods:

• Utilized a metalens array to experimentally generate a 5x5 CV EPR entanglement array.
• Constructed a five-user AOQSS network based on the generated compact EPR entanglement array.
• Evaluated the network's performance by measuring its fidelity against classical limits.

Main Results:

• Successfully generated a compact 5x5 CV EPR entanglement array using a metalens array.
• Established a five-user AOQSS network with fidelity surpassing the classical limit.
• Demonstrated the largest AOQSS network in the CV regime to date.

Conclusions:

• The metasurface-based approach provides a promising platform for generating massive and compact CV EPR entangled states.
• This work paves the way for the construction of large-scale, all-optical multiuser quantum networks.
• The compact generation of CV EPR entanglement using metasurfaces opens new possibilities for advanced quantum network development.