Cybersecurity professionals have long had high hopes for a quantum Internet, given that any attempt to intercept data alters it, which exposes the intrusion. This basic principle of physics positions quantum networking as a potential structural shift in cybersecurity.

New research from New York University, in collaboration with Qunnect and Cisco, brings that concept closer to reality. The team has demonstrated that entangled quantum signals can be distributed across multiple nodes using existing fiber infrastructure in New York City, marking a transition from laboratory experiments to real-world deployment.

“This project is really about proving that quantum networks can run over traditional infrastructure,” Tom Hollingsworth, Networking Technology Advisor at the Futurum Group, told Security Boulevard. “Getting a quantum network signal through a busy network in NYC is the first step in proving it can run over longer distances, including across the globe and even farther into space.”

Major Implications for Cybersecurity

The New York system connects three nodes across commercial telecommunications fiber, linking sites in Brooklyn and Manhattan through a central hub. The experiment involves entanglement swapping, a process that allows independent quantum systems to become correlated without direct interaction. This capability is essential for scaling quantum networks beyond point-to-point links.

From a cybersecurity perspective, there are major implications. Quantum communication relies on photons that carry information in fragile quantum states. Any attempt to observe or intercept those states introduces detectable disturbances. Unlike traditional encryption, which depends on deep computational complexity, quantum systems offer a model where data integrity is enforced by physical laws.

While performance remains limited, the New York results demonstrate the ability for quantum signal transfer to operate over existing infrastructure. The network achieved entanglement swapping across deployed fiber rather than specialized laboratory setups, showing that quantum systems can coexist with current telecommunications frameworks.

For cybersecurity deployments, this structure could support distributed secure communication across financial institutions, data centers, or government facilities within a city.

In the near term, the most immediate cybersecurity application is quantum key distribution. This approach allows encryption keys to be exchanged with detection of interception attempts, addressing a major concern as quantum computing threatens current cryptographic standards. Over time, applications may include secure links between quantum computers and distributed sensing networks.

Support from Cisco and Qunnect

Software orchestration played a key role. Cisco’s quantum networking stack synchronized the distributed nodes, managing timing, calibration, and data correlation. This was needed because quantum interactions require extreme precision. For instance, photons from separate sources must arrive within narrow time windows for entanglement to occur. Automating this process replaces earlier approaches that needed fixed hardware connections, which are difficult to scale.

This transition to software-defined coordination creates a parallel with traditional network security. Just as modern cybersecurity relies on centralized monitoring and automated response, quantum networks will depend on orchestration layers to maintain performance. The difference is that the underlying security model is not algorithmic but physical.

Qunnect’s hardware components, including entanglement sources and signal stabilization systems, handled another practical challenge: maintaining quantum states over long distances. Fiber networks are subject to constant environmental fluctuations that disrupt photon transmission. The system compensates for these effects in real time, enabling sustained operation across the network.