📡 Stony Brook and Brookhaven demonstrate a “wireless” quantum network link across 13 miles 📡
Researchers transmitted quantum information through open air between Stony Brook University and Brookhaven National Laboratory, adding a free-space optical link to a 161-mile quantum network.
🔑 Key points
🔹 13-mile free-space connection: Photons traveled approximately 21 kilometers between Stony Brook’s Quantum Watchtower and Brookhaven’s Quantum Lighthouse.
🔹 First U.S. demonstration of its kind: The project is the first reported U.S. demonstration of a free-space optical link connecting quantum-network facilities.
🔹 Daytime test used individual photons: Researchers transmitted light particles containing quantum information between fiber-optic systems separated by several miles.
🔹 Entangled photons were successfully received: During nighttime testing, researchers transmitted and measured entangled photon pairs across the new wireless link.
🔹 Eight-node network already exists: The project extends a quantum network connecting eight nodes across institutions in Long Island and the New York metropolitan area.
🔹 Fiber has limitations: Existing fiber networks are restricted to certain telecommunications wavelengths and can be difficult or expensive to extend over long distances.
🔹 Atmospheric transmission creates new challenges: Turbulence, background light, alignment, and signal loss must be controlled to preserve fragile quantum states.
🔹 Astronomy technology helped solve the problem: Telescope-style optics and precision tracking were used to collect and direct photons across the open-air path.
🔹 Yale connection is next: Researchers plan to connect the Stony Brook and Yale facilities across approximately 30 miles of Long Island Sound.
🔎 Why it matters
🔹 Quantum networks need more than powerful computers—they need reliable ways to connect quantum devices across long distances.
🔹 Free-space optical links could extend quantum communication beyond the physical limits of fiber cables.
🔹 Satellite links could eventually connect remote or rural regions with limited telecommunications infrastructure.
🔹 Entanglement may support secure communication, quantum sensing, and distributed quantum computing—but it does not enable faster-than-light messaging.
🔹 The demonstration is an important infrastructure milestone, not yet a global quantum internet.
🎯 Bottom line: Stony Brook and Brookhaven have shown that quantum information can be transmitted through open air across 13 miles, expanding an existing fiber-based quantum network. The next challenges are longer distances, weather resilience, satellite integration, and reliable connection of quantum processors. The future is promising, but the world is still in the experimental networking phase.
https://news.stonybrook.edu/university/stony-brook-brookhaven-lab-researchers-demonstrate-wireless-capability-for-quantum-network/