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This review consolidates recent progress in integrating diamond color defects with photonic circuits as viable candidates for scalable quantum communication nodes. By leveraging extended spin coherence times and efficient optical interfaces, these solid-state systems address critical hurdles toward metropolitan-scale entanglement distribution and distributed computing. The analysis highlights that while significant experimental challenges remain, this approach offers a distinct pathway to revolutionizing secure quantum networks beyond current disparate architectures.

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Diamond Defects Could Form the Basis of Future Quantum Communication Networks

Quantum ZeitgeistJune 7, 20265 min read

Recent advances in diamond nanophotonics have led to significant improvements in photon collection efficiency and light, matter interaction strength, paving the way toward integrated and scalable quantum processors and network nodes. Until now, building the fundamental components for large-scale quantum networks has relied on disparate systems, hindering practical deployment. Integrating diamond colour defects with photonic integrated circuits offers a pathway towards demonstrable metropolitan-scale entanglement distribution and a new generation of scalable quantum nodes.

A thorough review details how diamond colour defects represent a leading candidate for constructing the nodes of future large-scale quantum networks, with potential to revolutionise quantum communication and distributed computing. Ayan Majumder and colleagues at Indian Institute of Technology Bombay, in collaboration with Northwestern University, highlight the favourable optical properties and extended spin coherence times exhibited by these defects. Recent advancements in integrating diamond nanophotonics with photonic integrated circuits are also presented, paving the way towards more efficient and scalable quantum architectures. The review consolidates current progress and critically assesses both the fundamental and experimental key hurdles remaining…

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