Wireless Quantum Network Breakthrough | How It Works

Bridging the Wireless Quantum Divide

Researchers at Brookhaven National Laboratory and Stony Brook University have successfully transmitted quantum information through 13 miles of open air. This achievement marks the first demonstration of its kind in the United States and extends an existing quantum network beyond the constraints of fiber-optic cables. The team used a precision free-space optical link to carry quantum states across the distance between the two institutions in New York.

This experiment represents a major step toward creating an interconnected research ecosystem. By moving outside the physical path of underground cabling, scientists hope to integrate quantum computing, artificial intelligence, and specialized sensing hardware into a single operational system. The project utilized high-precision telescopes adapted for quantum experiments to ensure that fragile states of light were not lost or distorted by the turbulent atmosphere between Upton and Stony Brook.

Technical Implementation and Precision

During a daytime demonstration, the researchers used a laser to generate quantum states of light. These individual photons exited an optical fiber less than one-tenth the width of a human hair. The beam traveled 13 miles to a receiving aperture at Brookhaven's Quantum Lighthouse. The project required integrating optics, control systems, and detectors at both locations to ensure the entire apparatus functioned as one coherent experiment.

Nighttime tests provided a clearer environment for the transmission of entangled photons. These entangled pairs remain linked by the laws of quantum mechanics regardless of the distance between them. Measuring one photon instantly reveals information about its counterpart, a property that forms the basis for secure communications and advanced sensing. By using infrared wavelengths native to quantum processors, the team avoided the limitations of traditional telecommunications-grade fibers.

Future Network Expansion and Satellite Goals

With the initial link established, the team has turned its attention to a 30-mile connection involving Yale University. This third node will cross the Long Island Sound and further test the resilience of wireless quantum signals. Establishing these long-distance connections serves as a proof-of-concept for the broader goal of a national quantum internet.

Long-term plans involve transmitting quantum information through the atmosphere to orbiting satellites. If successful, this would enable secure quantum communications in remote locations that lack ground-based infrastructure. Researchers view this progression as a natural evolution for the field, similar to how the classical internet moved from strictly wired networks to a combination of wired and wireless technologies. This work positions New York as a central hub for quantum development and sets a technical standard for the future of distributed quantum systems.