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US quantum communication breakthroughs

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2026-08-01 23:11 UTC → 2026-08-19 18:36 UTC · added removed

In late July 2026 2026, researchers at Northwestern University first demonstrated that entangled photon pairs could be transmitted over a 24.4‑kilometre 24.4-kilometre commercial fiber‑optic fiber-optic link in Chicago while the same cable carried high‑capacity high-capacity internet traffic, preserving more than 94 % 94% entanglement fidelity. This experiment showed that delicate quantum signals can coexist with existing telecom infrastructure, a key step toward practical metropolitan quantum networks. A week later, additional work expanded was complemented by the scope use of quantum communications. A deep‑learning adaptive‑optics a deep-learning adaptive-optics system was used to correct atmospheric turbulence, enabling free‑space free-space quantum key distribution (QKD) over 1.4 km and 7 km links even in daylight—overcoming daylight. By mid-August 2026, the long‑standing limitation scope of night‑only QKD. The same study reiterated these advancements expanded to include longer distances and improved data capacity. In Maryland, scientists from the Northwestern fiber‑entanglement result, underscoring that both free‑space National Institute of Standards and fiber‑based Technology and the University of Maryland successfully transmitted entangled photons across 62 kilometres of existing fiber-optic cable. To mitigate signal distortion caused by environmental stressors on above-ground cables, the team employed a real-time correction system to stabilize quantum links can operate alongside conventional states. Simultaneously, researchers from the University of Geneva, alto University, and PSL University achieved a breakthrough in quantum memory. By using a rare-earth-ion ensemble, they demonstrated the storage of entanglement across 16,340 temporal modes—nearly doubling previous limits. This method, which utilized a 250MHz bandwidth to store photons for up to 63 microseconds over 5.66 km of metropolitan fiber, allows for significantly higher data traffic. Together, these advances point transmission rates by exploiting multiple spectral channels. These cumulative developments suggest a path toward all‑day, robust, high-capacity, and all-day hybrid quantum communication networks that could form the backbone of future global quantum infrastructure. networks.

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  1. 2026-08-19 18:36 UTC US quantum communication breakthroughs
  2. 2026-08-01 23:11 UTC US quantum communication breakthroughs

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