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Researchers have successfully demonstrated a large-scale fully connected quantum network spanning over 200 kilometers with support for 200 users, addressing critical scalability hurdles through integrated soliton microcomb technology. This architecture enables secure user-to-user communication without trusted intermediaries by leveraging massive parallel frequency channels and precise locking mechanisms to eliminate previous vulnerabilities in point-to-point designs. The breakthrough utilizes compact photonic chips that generate hundreds of parallel channels simultaneously, offering a more stable path toward metropolitan-scale quantum networks compared to traditional methods.
Researchers Build First Fully Connected Quantum Network with Microcombs
Fully connected quantum networks, enabling simultaneous connection between every user, face scalability challenges despite being the most versatile and robust networking architecture. Researchers constructed a large-scale version of this network, guaranteeing user-to-user security even with an untrusted provider, using integrated soliton microcomb and photonic encoding chips.
Researchers in China have built a large-scale fully connected quantum network, meaning every user can connect to every other user simultaneously, overcoming a major scalability challenge in quantum communication. The network spans over 200 kilometers and supports 200 users while guaranteeing user-to-user security even with an untrusted network provider. This large-scale system utilizes integrated soliton microcombs to achieve precise frequency generation and locking, enabling high-visibility Hong-Ou-Mandel interferences and measurement-device-independent quantum key distribution. The implemented architecture, the researchers state, “paves the way for realizing large-scale fully connected MDI quantum networks across metropolitan and intercity regions.” This architecture, detailed in recent findings, departs from traditional point-to-point quantum key distribution by enabling a system where each of the 200 users can establish a secure connection with any…
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