Deterministic Generation of Orbital-Angular-Momentum Multiplexed Tripartite Entanglement

Area of Science:

• Quantum Information Science
• Quantum Optics
• Quantum Communication

Background:

• Multipartite entanglement is crucial for advanced quantum information processing.
• Orbital angular momentum (OAM) offers a high-dimensional encoding capability for quantum states.
• Continuous variable (CV) systems provide a robust platform for quantum entanglement generation.

Purpose of the Study:

• To experimentally demonstrate the generation of OAM multiplexed multipartite entanglement in a CV system.
• To explore the rich entanglement structure achievable through cascaded four-wave mixing.
• To pave the way for CV parallel quantum networks.

Main Methods:

• Utilizing cascaded four-wave mixing processes in a continuous variable system.
• Implementing multiplexing of orbital angular momentum states.
• Employing Laguerre-Gauss (LG) modes for entanglement distribution.

Main Results:

• Simultaneous generation of 9 sets of OAM multiplexed tripartite entanglement over 27 LG modes.
• Generation of 20 sets of OAM multiplexed bipartite entanglement over 40 LG modes.
• Creation of tripartite entanglement using coherent OAM superposition modes.

Conclusions:

• The experimental generation of OAM multiplexed multipartite entanglement showcases a rich entanglement structure.
• This work enables the construction of CV parallel quantum networks.
• The developed techniques support parallel quantum information protocols.