Defense Advanced Research Projects Agency (DARPA) researchers achieved a breakthrough in practical quantum networking, successfully integrating quantum links into classical network infrastructure.

In a cross-team hackathon, the Quantum-Augmented Network (QuANET) program demonstrated uninterrupted data transmission across an entire quantum-augmented network, achieving transmission times of 0.7 milliseconds, equivalent to a 6.8 Mb/s bit rate – that's fast enough for HD video streaming.

Unlike standalone quantum networks being developed elsewhere, DARPA's approach focuses on hybrid integration with existing classical infrastructure.

Researchers transmitted encoded data, including images of the DARPA logo, a QuANET event graphic, and ASCII art of a cat. While initial transmissions took around five minutes, the engineers were able to bring that down to never-before-achieved speeds using real-time optimization.

The milestone, reached just 10 months into the program, marks a critical step toward making quantum networking practically viable within existing network architectures rather than requiring completely separate, isolated systems.

“This represents a major step toward practical quantum-augmented networking,” QuANET program manager Allyson O’Brien explained. “By enabling quantum links to operate within existing communication network architectures, we’re unlocking the potential for broader access to quantum network technology, offering a new pathway towards significantly improved security, efficiency, privacy, and resiliency.”

The hackathon is part of the QuANET program’s wider efforts to create more accessible, integrated quantum-enhanced networks that could potentially support secure global communications.

DARPA's achievement adds to the growing momentum in quantum networking.

U.S.-based startup IonQ is attempting to develop quantum networking solutions, with its EPB Quantum Network already commercially available, powering secure workloads for public and private sector researchers. Cisco is also looking into the nascent area, having recently backed New York-based Qunnect, a firm focusing on applying quantum memory to network transport.

Meanwhile, on the academic side, a recent breakthrough from researchers at the University of British Columbia saw the creation of a “universal translator” for quantum computers that effectively allows disparate systems to communicate over a network with virtually no noise.

DARPA’s quantum network efforts will continue, with the QuANET program set to conduct its first Phase test event later this fall.

Tests will see its researchers feature fielded fiber optics capable of supporting both quantum and classical links that will operate in tandem with optical switches and routers to send and receive data in an early look at how a quantum-classical architecture might function in operational settings.

“This is not just about making quantum networks work in the lab,” O’Brien added. “It’s about enabling quantum systems to integrate into the real-world networks we rely on today and shaping the networks we’ll rely on tomorrow.”