Multiplexed entanglement of multi-emitter quantum network nodes.

Area of Science:

• Quantum Information Science
• Solid-State Quantum Systems
• Quantum Networking

Background:

• Current quantum networks are limited by single-qubit nodes, hindering scalability and performance.
• Solid-state platforms offer potential for multiplexed quantum networking with multiple qubits per node.
• Rare-earth ions coupled to nanophotonic cavities are promising candidates for advanced quantum network nodes.

Purpose of the Study:

• To implement a scalable two-node quantum network using multi-emitter solid-state nodes.
• To demonstrate enhanced entanglement distribution rates via multiplexing.
• To prepare multipartite W-states for advanced quantum networking protocols.

Main Methods:

• Utilized rare-earth ions (specifically 171Yb) coupled to nanophotonic cavities.
• Employed a protocol involving frequency-erasing photon detection and real-time quantum feedforward for entanglement.
• Demonstrated robustness against slow optical frequency fluctuations.
• Implemented multiplexed entanglement of remote ion pairs.
• Prepared three-ion W-states.

Main Results:

• Successfully implemented a two-node quantum network with multi-emitter nodes.
• Achieved enhanced entanglement distribution rates by multiplexing remote ion pairs.
• Demonstrated the preparation of multipartite W-states with three distinguishable ions.
• Showcased a protocol robust to environmental frequency fluctuations.

Conclusions:

• The developed multi-emitter solid-state nodes are crucial for scalable quantum networking.
• This approach overcomes limitations of single-qubit nodes, improving bandwidth and memory.
• The results pave the way for advanced quantum communication, computing, and sensing technologies based on rare-earth ions.