Quantum Networking Applications for Network Management

DARPA’s QuANET researchers have demonstrated the first functioning quantum-augmented network. Less than a year ago DARPA launched a new program called QuANET (Quantum-Augmented Network) to answer: Can we combine the best of classical and quantum communications to create a vastly more secure, resilient network? QuANET’s mission is to integrate quantum links into today’s internet infrastructure. The goal is to marry the unique “covertness” (stealth) of quantum communications with the ubiquity and scale of classical networks . And QuANET researchers just demonstrated a functioning quantum-augmented network. They encoded and sent images as quantum data on a beam of “squeezed” light. The initial attempt took five minutes, but after real-time optimization the team slashed it to just 0.7 milliseconds (~6.8 Mbps) – fast enough to stream HD video. This rapid improvement, achieved only ~10 months into the project, shows how quickly quantum networking is moving from lab theory toward practical reality. From a cybersecurity standpoint, QuANET could be impactful. Even the most advanced classical networks today remain vulnerable to relentless cyberattacks, whereas quantum communication can inherently bolster resilience – any eavesdropping or tampering attempt would disturb the quantum data and be detected. By embedding quantum encryption and transmissions into network architectures, QuANET aims to make critical infrastructure much harder to compromise. I find QuANET’s emergence to be a significant milestone. For years, quantum networking (even quantum-augmented networking) have been a niche research topic – often confined to laboratory demos or isolated testbeds. Now we’re seeing a major R&D agency actively bridging quantum and classical networks, which is a big leap toward mainstream adoption. It’s not every day you hear about an ASCII-art cat being beamed over a quantum link. More importantly, it shows that quantum-secure communication is becoming a reality. #Quantum #QuantumNetworking #PQC https://lnkd.in/gEhszfaC

World-First Photon Router Bridges Quantum Computers and Fiber Networks Harvard and Partners Develop Key Technology for Scalable Quantum Networks In a groundbreaking advancement for quantum communication, scientists at Harvard’s School of Engineering and Applied Sciences (SEAS), along with collaborators from Rigetti Computing, MIT, and the University of Chicago, have developed the world’s first functional photon router capable of linking noise-sensitive microwave quantum computers to global fiber-optic networks. This innovation is seen as a critical step toward building scalable, real-world quantum internet infrastructure. The Quantum Network Challenge • Quantum Computers Need Quantum Networks • Quantum computers operate on qubits, which are highly sensitive quantum states requiring ultra-low temperatures to remain stable and coherent. • While practical in controlled lab environments, these extreme conditions are infeasible for long-range communication, preventing direct scaling into broad networks. • Photon-Based Communication as the Solution • Unlike qubits, photons—light particles—can carry quantum information across fiber-optic cables over great distances with minimal degradation. • The challenge is enabling quantum computers, which operate using microwave signals, to exchange information using optical photons. Introducing the Microwave-Optical Quantum Transducer • What It Is and What It Does • The new device functions as a photon router, converting fragile microwave signals from quantum processors into optical photons that can travel through existing telecom networks. • It enables quantum systems to interface with classical infrastructure without disturbing the quantum data. • Technical Feat and Real-World Application • The device preserves quantum coherence while translating between two radically different energy domains: microwaves (used inside quantum computers) and optical frequencies (used in fiber-optic networks). • This microwave-optical transduction is essential for establishing quantum repeaters and routers, key components of a quantum internet. Broader Implications for Quantum Technology • Unlocking a Scalable Quantum Internet • The photon router could allow quantum computers in different locations to share entangled states, conduct distributed quantum computing, and enable secure quantum communication over long distances. • This advancement paves the way for a modular quantum computing architecture, in which multiple quantum processors work together via a shared network. • Positioning the U.S. at the Forefront • With government and industry alike pushing to secure technological leadership in quantum systems, this innovation places U.S. research institutions and startups ahead in developing quantum-compatible communication layers.

⚛️ Toward quantum-safe scalable networks: an open, standards-aware key management framework 📑 With the advent of quantum computing, the increasing threats to security poses a great challenge to communication networks. Recent innovations in this field resulted in promising technologies such as Quantum Key Distribution (QKD), which enables the generation of unconditionally secure keys, establishing secure communications between remote nodes. Additionally, QKD networks enable the interconnection of multinode architectures, extending the point-to-point nature of QKD. However, due to the limitations of the current state of technology, the scalability of QKD networks remains a challenge toward feasible implementations. When it comes to long-distance implementations, trusted relay nodes partially solve the distance issue through the forwarding of the distributed keys, allowing applications that do not have a direct QKD link to securely share key material. Even though the relay procedure itself has been extensively studied, the establishment of the relaying node path still lacks a solution. This paper proposes an innovative network architecture that solves the challenges of Key Management System (KMS) identification, relay path discovery, and scalability of QKD networks by integrating Software-Defined Networking (SDN) principles, and establishing high-level virtual KMSs (vKMS) in each node and creating a new entity called the Quantum Security Controller (QuSeC). The vKMS serves the end-user key requests, managing the multiple KMSs within the node and abstracting the user from discovering the correct KMS. Additionally, based on the high-level view of the network topology and status, the QuSeC serves the path discovery requests from vKMSs, computing the end-to-end (E2E) relay path and applying security policies. The paper also provides a security analysis of the proposal, identifying the security levels of the architecture and analyzing the core networking security properties. ℹ️ Sanz et al - 2025

Under the streets of Manhattan and Brooklyn. Through 60 Hudson, one of the most connected carrier hotels in the world. Real quantum entanglement at scale on 17.6 km of standard telecom fiber. With swapping rates 3+ orders of magnitude beyond prior efforts and fidelity above 99%. This is the full quantum networking stack coming together — hardware, protocol, control, orchestration. Most importantly, we ran this without the shared laser crutch that makes lab experiments unscalable by design. This real-world demo used fully independent quantum sources at each endpoint. With Cisco's quantum software stack handling timing coordination at picosecond precision across three geographically separated nodes using the White Rabbit protocol. Qunnect's room-temperature hardware at the edges. And cryogenic equipment only at the hub for efficiency. Any new nodes could be added to this network without touching the sync infrastructure. And with clean control and data plane separation.   Applying design patterns that scaled the classical internet to quantum networking. I wrote about what this milestone means and how it leads us one step closer to our vision of a quantum data center network, on the Cisco blog today. 🔗 Link in comments. 📸 Photo of Manhattan from the Brooklyn end, by me.