Ask any IT manager who has priced out running fiber under a state highway how fast that plan gets abandoned. Trenching a single mile of cable can run past six figures once permits, crews, and repaving are factored in. That is the real-world hurdle Brookhaven National Laboratory and Stony Brook University just found a way around for quantum networks.
Quantum computers need a way to talk to each other, and most quantum networks today run through that same buried fiber-optic cable. Researchers at the two institutions just showed a second option. They beamed entangled photons through 13 miles of open night air and kept the connection intact. It’s the first wireless quantum network demonstration of its kind in the United States, and it opens a path toward linking quantum computers without laying a single foot of cable.
The team built two rooftop stations for the test. Brookhaven’s station is called the Quantum Lighthouse. Stony Brook’s is the Quantum Watchtower. Each one generates individual photons with lasers and feeds them through fiber cores just five microns wide. Then it fires them across the gap using telescope optics borrowed from astronomy. Astronomers have spent decades learning how to keep a signal steady through shifting night air, and this team put that experience to work.
At the far end, researchers measured the photons and confirmed they stayed entangled. That’s the property Einstein called “spooky action at a distance,” where measuring one photon instantly tells you something about its twin no matter the distance between them. Holding entanglement across open air, not just inside a fiber, is the hard part. Atmospheric turbulence scrambles light easily, and a single lost photon can break the whole link. The fact that this Brookhaven-Stony Brook link held up says the optics and pointing systems are precise enough for real use, not just a lab curiosity.
Why a Wireless Quantum Network Changes the Math
Fiber networks are reliable, but they’re expensive and slow to build. Crews have to dig trenches, get permits, and run cable block by block. A free-space optical link skips all of that. Two facilities just need a clear line of sight between them, so an IT manager overseeing a small clinic or town office could someday link secure sites without ever calling a trenching crew. That makes it far cheaper and faster to add new nodes to a network, especially across water, rugged terrain, or anywhere digging isn’t practical.
This test plugs into New York’s existing 161-mile quantum network, already the longest in the country. Wireless capability means that network can now reach places fiber can’t easily go. The team’s next steps include:
- A third rooftop station at Yale University, aiming for a 30-mile link across Long Island Sound
- A direct wireless connection between quantum computers at Brookhaven and Stony Brook
- Early tests of links to satellites, a step toward global quantum communication
What This Means for Quantum Computing
A single quantum computer can only handle so many qubits before errors pile up. Labs are attacking that problem directly, too. See the AI decoder that’s already beating standard error-correction benchmarks on real hardware. Networking gives quantum computing another way forward. Instead of building one giant machine, labs can link several smaller, more manageable ones together, the same strategy Japan is testing with its new neutral-atom quantum computer. That only works if the connections between them are fast and secure, and don’t require a fiber trench everywhere. This demonstration shows wireless links can carry that job.
It also strengthens the case for quantum-secure communication. Entangled photons can carry encryption keys that are physically impossible to intercept without detection. A wireless version of that link means secure quantum communication could reach mobile platforms, disaster zones, or military assets, places fiber will never reach. Pair that with the hardware scaling work IBM has been doing with its modular cryogenic cooling systems, and the pieces of a distributed, networked quantum future are starting to look concrete.
If a hospital, a utility, or a small town could skip a six-figure trenching bill and still get an unhackable link, would that change how fast places outside big cities get access to secure networks?