Photonic Quantum Networks formed from NV(-) centers

Area of Science:

• Quantum Information Science
• Optoelectronics
• Materials Science

Background:

• Quantum repeaters are essential for long-distance quantum communication.
• Existing quantum repeater schemes face challenges in scalability and fidelity.
• Nitrogen-vacancy (NV) centers in diamond offer promising properties for quantum memory and entanglement generation.

Purpose of the Study:

• To present a simple, resource-modest quantum repeater scheme.
• To demonstrate high-fidelity operations using NV centers.
• To enable large-scale quantum networks with near-future technology.

Main Methods:

• Utilizing negatively-charged nitrogen vacancy centers (NV(-)) in diamond as quantum memory.
• Building repeater nodes from optical cavities containing single NV(-) centers and nuclear spins.
• Connecting repeater nodes using optical fiber and entangled photon pairs.
• Employing deterministic processes for high-fidelity operations (>99%).

Main Results:

• A resource-modest quantum repeater architecture with two modules per node.
• High-fidelity operations (>99%) achieved through deterministic processes.
• Demonstration of a quantum repeater network architecture using NV(-) centers and entangled photon pairs.

Conclusions:

• The proposed repeater scheme is compatible with existing or near-future technology.
• The architecture facilitates the development of large-scale quantum information networks.
• The modular design allows for scalable integration and performance enhancement.