Quantum Networking Solutions

Researchers at Northwestern University (USA) have made a significant breakthrough in quantum communication by successfully teleporting a quantum state of light—a qubit carried by a photon—through approximately 30 kilometers of optical fiber while simultaneously transmitting high-speed classical data traffic. Key details include: - The fiber length used was around 30.2 km. - It carried a classical signal of approximately 400 Gbps in the C-band alongside the quantum channel. - The quantum channel operated in the O-band, utilizing special filtering and narrow-temporal/spectral techniques to shield delicate photons from noise, such as spontaneous Raman scattering from the classical channel. This experiment confirms that quantum teleportation of a quantum state can coexist with classical internet traffic in the same fiber infrastructure. It's important to clarify that "teleportation" in quantum communication does not involve moving the physical photon or "beaming" objects as depicted in science fiction. Instead, it refers to the transfer of the quantum state of a qubit from one location to another using an entanglement-based protocol, coupled with classical communication. The original qubit is destroyed during this process and recreated at the destination. While quantum teleportation enables inherently secure quantum communication channels—since measurement disturbs quantum states—practical deployment still faces challenges, including node security, classical channel security, side-channels, and error rates. This marks a significant step toward quantum-secure networks, though it is not yet a complete "unhackable" solution. This experiment suggests that we may not require entirely separate fiber infrastructure dedicated solely to quantum communications; existing telecom fiber could be effectively utilized. It enhances the feasibility of developing quantum networks and, eventually, a "quantum internet" that integrates with classical infrastructure. From a security and cyber perspective, it supports the architecture of quantum-secure communications, including quantum key distribution and entanglement-based signaling. Overall, this represents a major technological milestone in photonics, quantum information science, and telecom integration.

Scientists from Russia and China have allegedly achieved quantum communication encryption using secure keys transmitted by China's quantum satellite Mozi. Quantum communication encryption uses the principles of quantum mechanics to establish secure communication channels. It aims to create unbreakable encryption, making it highly attractive for applications where the highest level of security is essential, such as in transmitting sensitive information in fields like finance, government, and defense. This breakthrough demonstrates the technical feasibility of establishing a BRICS (Brazil, Russia, India, China, South Africa) quantum communication network. The researchers managed to cover a distance of 3,800 kilometers between a ground station near Moscow and another close to Urumqi in China's Xinjiang region, transmitting two encoded images secured by quantum keys, reported the South China Morning Post. The first full-cycle quantum communication test between the two countries took place in March 2022, according to Alexey Fedorov from Russia’s National University of Science and Technology and the Russian Quantum Centre. A secret key was passed on during this experiment, transferring two coded messages decrypted using keys based on a quote from Chinese philosopher Mozi and an equation from Soviet physicist Lev Landau. The collaboration utilized China’s quantum satellite, Mozi, which has paved the way for the development of both national and international quantum communication networks. Quantum communication provides a secure way to transfer information, making it resistant to eavesdropping by hackers. The encrypted data is transferred as ones and zeros along with a quantum key, ensuring that unauthorized individuals cannot access the information. However, limitations in ground-based quantum key distribution arise due to the loss of photons over long distances, capping optical fiber cable transfers at around 1,000 kilometers. China’s Mozi, the world's first quantum communication satellite launched in 2016, overcomes this. It allows for long-distance quantum transmission. The satellite enables the establishment of a national quantum network in China, spanning thousands of kilometers. Full Article: https://lnkd.in/gSji8E3j #Mozi #Encryption #QuantumComms China’s quantum satellite Mozi has opened pathways to develop national and international quantum communication networks. (CAS)

In a world-first, U.S. researchers have teleported a quantum state of light across 30 kilometers of standard internet fiber while normal web traffic flowed through the same cables. This marks the first time quantum teleportation has succeeded over a live, public-style network. The team synchronized quantum photons with regular data signals, keeping their fragile quantum properties intact throughout the journey. The result? Proof that quantum communication can coexist with today’s internet no massive infrastructure overhaul needed. The implications are staggering: ultra-secure, unhackable communication, powered by the laws of physics. The dream of a global quantum internet is no longer science fiction it’s happening now. Sources: Oxford, Caltech, U.S. Department of Energy, Nature Photonics, National Geographic

IonQ's share price has been on a run. Let’s set markets aside and look at the technology and strategy driving the company. 𝗖𝗼𝗿𝗲 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝘆 IonQ’s systems are based on 𝘁𝗿𝗮𝗽𝗽𝗲𝗱-𝗶𝗼𝗻 𝗾𝘂𝗯𝗶𝘁𝘀 - individual atoms confined in electromagnetic fields and manipulated with lasers. This approach is valued for its long coherence times and all-to-all qubit connectivity, though it comes with trade-offs such as slower gate speeds. Progress is tracked with so-called '𝘢𝘭𝘨𝘰𝘳𝘪𝘵𝘩𝘮𝘪𝘤 𝘲𝘶𝘣𝘪𝘵𝘴' (𝘈𝘘) - today at 36, with the Tempo system targeting #AQ 64. 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 & 𝗘𝗰𝗼𝘀𝘆𝘀𝘁𝗲𝗺 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 The go-to-market approach is hybrid. Integration with NVIDIA'𝘀 𝗖𝗨𝗗𝗔-𝗤 embeds IonQ’s QPUs into HPC workflows, aiming at reducing classical overhead and lowering adoption barriers for enterprise users. 𝗦𝗰𝗮𝗹𝗶𝗻𝗴 & 𝗡𝗲𝘁𝘄𝗼𝗿𝗸𝗶𝗻𝗴 Scaling is pursued via 𝗺𝗼𝗱𝘂𝗹𝗮𝗿, 𝗻𝗲𝘁𝘄𝗼𝗿𝗸𝗲𝗱 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲𝘀, not monolithic chips. This direction is backed by U.S. Department of Defense and Department of Energy contracts focused on secure distributed quantum networks, with the long-term goals of extending these capabilities to space-based systems. 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝗶𝗰 𝗔𝗰𝗾𝘂𝗶𝘀𝗶𝘁𝗶𝗼𝗻𝘀 IonQ’s M&A strategy is combined vertical integration with diversification: • Oxford Ionics: Ion-trap-on-chip IP to strengthen manufacturable, high-fidelity qubits. • Qubitekk, Inc.: Quantum networking hardware and IP, essential for distributed architectures. • Lightsynq: Photonic interconnects and memory technology, supporting modular scaling. • Capella Space: Satellite assets and expertise relevant to space-based quantum networking. • ID Quantique: Quantum-safe communications and cryptography IP, bolstering the security side of the stack. • Vector Atomic (pending): Expansion into quantum sensing. Unlike most quantum players who focus more narrowly on scaling a single hardware stack, IonQ is building across compute, networking, sensing, and security. It’s a broader play than we’re used to seeing in this field. The challenge now lies in execution: Integrating this many acquisitions is never simple, and the key question is how quickly they can translate into results. 📸 Credits: Perplexity, IonQ

Check out the latest from MIT EQuS and Lincoln Laboratory published in @NaturePhysics! In this work, we demonstrate a quantum interconnect using a waveguide to connect two superconducting, multi-qubit modules located in separate microwave packages. We emit and absorb microwave photons on demand and in a chosen direction between these modules using quantum entanglement and quantum interference. To optimize the emission and absorption protocol, we use a reinforcement learning algorithm to shape the photon for maximal absorption efficiency, exceeding 60% in both directions. By halting the emission process halfway through its duration, we generate remote entanglement between modules in the form of a four-qubit W state with concurrence exceeding 60%. This quantum network architecture enables all-to-all connectivity between non-local processors for modular, distributed, and extensible quantum computation. Read the full paper here: https://lnkd.in/eN4MagvU (paywall), view-only link https://rdcu.be/eeuBF, or arXiv https://lnkd.in/ez3Xz7KT. See also the related MIT News article: https://lnkd.in/e_4pv8cs. Congratulations Aziza Almanakly, Beatriz Yankelevich, and all co-authors with the MIT EQuS Group and MIT Lincoln Laboratory! Massachusetts Institute of Technology, MIT Center for Quantum Engineering, MIT EECS, MIT Department of Physics, MIT School of Engineering, MIT School of Science, Research Laboratory of Electronics at MIT, MIT Lincoln Laboratory, MIT xPRO, Will Oliver

Breakthrough in Quantum Networking: Two Independent Quantum Networks Successfully Fused Toward a Global Quantum Internet In a milestone achievement, scientists at Shanghai Jiao Tong University have merged two independent quantum networks—a first-of-its-kind feat that moves us closer to a true global quantum internet, where users anywhere on Earth could securely communicate and perform large-scale quantum computing through entanglement. The results, published in Nature Photonics, demonstrate the most complex multi-user quantum network to date, linking 18 active nodes across previously separate systems. Overcoming Major Barriers Unlike classical networks, fusing quantum networks is extremely difficult because entanglement must be maintained across independent systems without disrupting delicate quantum states. Previous networks used dense wavelength division multiplexing (DWDM), which proved limited in scalability. The Shanghai team overcame these limitations using multi-user entanglement swapping and an active temporal and wavelength multiplexing (ATWM) approach. Here’s how it worked: Two 10-node quantum networks were independently entangled. One node from each network was used to perform Bell-state measurements, linking the networks by collapsing their wave functions and creating shared entanglement across the remaining 18 nodes. This process effectively fused both systems into a single 18-user quantum network, enabling secure communication between any two users using quantum key distribution (QKD). High-Quality Entanglement Achieved The merged network demonstrated exceptional quantum coherence, with entanglement fidelities above 84% and interference visibilities reaching up to 90.7%—far beyond the classical limit of 50%. These results validate both the strength and reliability of the fusion process, marking a significant leap in multi-user quantum communications. The Road Ahead While this fusion represents a breakthrough, scaling such networks across cities—or even continents—will require further innovation in quantum repeaters and quantum memory systems, which can preserve entanglement over long distances. The researchers remain optimistic, noting that their approach “opens attractive opportunities for establishing quantum entanglement between remote nodes in different networks.” As Professor Yiwen Huang and the team emphasize, this development could ultimately enable interconnected intercity quantum communication networks, paving the way for the world’s first quantum internet backbone. Citation: Yiwen Huang et al., Quantum fusion of independent networks based on multi-user entanglement swapping, Nature Photonics (2025). DOI: 10.1038/s41566-025-01792-0 Follow me for future insights on quantum networking, AI infrastructure, and next-gen communications systems. Keith King https://lnkd.in/gHPvUttw

"An international research team led by QuTech has demonstrated a network connection between quantum processors over metropolitan distances. Their result marks a key advance from early research networks in the lab towards a future quantum internet. The team developed fully independent operating nodes and integrated these with deployed optical internet fiber, enabling a 25 km quantum link. The researchers' findings are published in the journal Science Advances. The internet allows people to share information (bits) globally. A future quantum internet will enable sharing quantum information (qubits) over a new type of network. Such qubits can not only take the values 0 or 1, but also superpositions of those (0 and 1 at the same time). In addition, qubits can be entangled, which means they share a quantum connection enabling instant correlations, no matter the distance." #quantumnetwork #quantuminternet

India just sent an unbreakable message — using quantum entanglement — through open air. No cables. No fiber. No leaks. Just quantum-secure communication… beamed over 1 km on IIT Delhi's campus. The age of quantum internet is starting — and India is officially on the map. How does this even work? Unlike the regular internet, which sends bits (0s and 1s) as voltage or light pulses, Quantum networks use the state of particles (like photons) to encode and transmit information. If someone tries to intercept or clone that state…It collapses instantly. You know you've been spied on. That's unhackable by design. This isn’t encryption. This is physics. The tech behind India’s breakthrough: - Entanglement-based free-space quantum communication - Achieved over 1 km with just air and optics - Quantum Bit Error Rate (QBER) < 7% — very clean - Secure key rate: 240 bits per second - Built by DRDO + IIT Delhi — not just academia, but defense-grade R&D Why this matters more than fiber-optic experiments: Free-space quantum links are the foundation of satellite-based quantum internet — → Think secure comms between ground stations, drones, or even battlefield units → Eventually: intercontinental quantum networks via satellites (like China’s Micius) India is not just catching up — it's quietly building sovereign, secure infrastructure. In an AI-dominated world, we’re sleepwalking into data vulnerability. But quantum gives us a hard stop. No backdoors. No brute-force cracking. If your future AI agent talks to another over a quantum channel — it’s private. Forever. What’s next? This demo is just 1 km. To build a true quantum internet, we’ll need: - Entanglement distribution over 100s of km - Quantum repeaters (hard problem, still unsolved) - Satellite-ground links - Cross-country secure mesh using QKD (Quantum Key Distribution) India has a ₹6,000+ crore mission for this — and DRDO's playing long-term. What should devs and architects take from this? You won’t write quantum apps tomorrow. But soon, your most secure APIs, contracts, or agent interactions may depend on quantum protocols. The future internet won’t just be faster. It’ll be physics-hardened. Imagine this: You open VS Code. You authenticate with a quantum key. Your model trains on quantum-safe data pipes. Your product is secure — not because you trust code, But because you trust the laws of nature. That’s what’s coming. Would love to hear from folks building in infosec, comms infra, or future networks. #QuantumInternet #DRDO #IITDelhi #Cybersecurity #PostQuantum #QKD #QuantumIndia #TechSovereignty #SecureCommunication #DeepTech #NextGenInternet #India2030 #TechLead #TeamLead #Founders #Startups #VC #VP #HR #TalentAcquisition #Hiring #Jobs #MERN #JS #Javascript #Developers #Devops #Coding #OpenSource #github #BuildInPublic

Beginners guide to the Architecture of Space Quantum Networks !! Quantum Key Distribution (#QKD) is revolutionizing secure communication, and the race is on to develop space-based solutions. Here's a breakdown of the key components that make up a #QIN : 1. Space Segment: The Foundation in Orbit 🚀Composition: This segment consists of satellites equipped with specialized tools for secure communication. These satellites house: 🛰️Entangled Photon Source (EPS): Generates entangled photon pairs, a critical element for QKD. 🛰️Optical Terminals (OTs): Two telescopes that precisely direct each photon of an entangled pair towards designated receivers. 🛰️ Payload Processor: The brain of the satellite payload, analyzing commands, monitoring source status, and controlling functions like time synchronization and telescope calibration. 🚀Functionality: 🛰️As a mid-point source, the Space Segment transmits entangled photons to receivers on the ground via downlink quantum optical beams. 🛰️ It also establishes classical communication channels (radio frequency or optical) with ground stations to exchange data related to QKD protocols. 2. Control Segment: The Brain of the Operation 🛰️ Function: This segment acts as the mission control for the Space QIN domain, ensuring the smooth operation of the Space Segment. It commands and controls the satellites, optimizing their performance and managing communication between different segments of the network. 3. Access Segment: The User Gateway 🛰️Function: The Access Segment serves as the entry point for users to connect to the QKD network. It provides secure communication channels, enabling users to transmit and receive information with the highest level of security. Users can connect directly or as part of a larger domain. 4. Mission Segment: The Maestro in Charge 🛰️ Function: This all-encompassing segment manages the entire Space QIN domain, overseeing both ground-based and space-borne assets. It includes the domain controller, which acts as the central authority for the entire network. The Mission Segment ensures seamless and secure communication across the network. This innovative technology promises unbreakable communication for governments, militaries, and financial institutions. The future of secure data transfer is taking shape! #QuantumTechnology #SpaceTech #SecureCommunication #QKD #ISRO