Quantum Technology Applications in Harsh Environments

China Tests World’s First Portable Quantum Radio for GPS-Denied Border Operations Introduction China has begun field-testing a portable quantum radio designed to operate in environments where GPS and conventional communications fail. The trials, conducted by the People’s Liberation Army Information Support Force, signal a significant step in moving quantum communications from laboratory research into frontline military use, particularly in remote and contested border regions. Key Developments and Technical Details First-of-its-kind quantum radio prototype The 6.6-pound, backpack-portable device successfully received and decoded radio signals from tens of miles away during live field exercises, providing real-time communication without reliance on GPS or fixed infrastructure. Built for obstructed terrain The system is intended for use in valleys, dense forests, canyons, and high-altitude border zones where terrain routinely degrades or blocks traditional communications. It is positioned as a resilient backup when standard networks fail. Miniaturized quantum reception mechanism Traditional long-range radios require large antennas that reduce mobility. Engineers redesigned the reception array using a quantum-based mechanism, shrinking it to just a few centimeters while preserving signal strength comparable to much larger systems. Operational mobility The compact design allows a single soldier to carry the device without impairing movement, addressing a long-standing tradeoff between range and portability in military radios. Expanded testing underway After initial trials in the Saibei grasslands north of the Great Wall, the PLA plans further testing in coastal frontline environments to validate performance across varied operational theaters. Strategic Context and Broader Implications China’s quantum radio trial reflects a broader push to integrate quantum technologies into military cyber, communications, sensing, and computing systems. Officials describe a rapid transition from lab-scale experiments to deployable equipment, enabled by centralized funding and close coordination between state laboratories, defense firms, and PLA procurement. As the United States and China compete for dominance in quantum technologies, systems that function reliably in GPS-denied environments could redefine battlefield resilience, secure communications, and future military balance. I share daily insights with 35,000+ followers across defense, tech, and policy. If this topic resonates, I invite you to connect and continue the conversation. Keith King https://lnkd.in/gHPvUttw

As GPS-denied environments become increasingly common, whether due to jamming, spoofing, or operating in contested regions, reliable alternatives are critical. Traditional inertial navigation systems (INS) offer one solution: if you know your starting point and can accurately measure acceleration and rotation, you can calculate your position. However, INS accuracy degrades over time due to sensor drift. Quantum navigation represents a step-change in capability. By leveraging the wave-like behavior of atoms through quantum interference, these systems can measure acceleration and rotation with unprecedented precision - without relying on external signals. This makes them inherently resilient to electronic warfare and ideal for submarines, aircraft, and space platforms operating in GPS-denied environments. For aerospace and defence, this technology offers operational resilience in contested domains; platform independence, enabling navigation across air, sea, and space; and, strategic advantage, reducing reliance on vulnerable satellite infrastructure. Australia’s interest in non-GPS navigation, highlighted by the Australian Naval Institute, underscores the urgency of advancing these technologies. Quantum navigation is a future enabler for assured positioning in the most challenging environments. https://lnkd.in/g6SRxj_s

Chinese engineers built a quantum radar system detecting stealth aircraft through any atmospheric condition reliably — a development with profound implications for global military technology balance, the future of stealth aviation, and the broader quantum sensing industry. The advantage that stealth technology has provided for 40 years may be approaching its technological ceiling. 🔬 Conventional radar works by emitting electromagnetic pulses and detecting their reflection from targets. Stealth aircraft defeat this by using radar-absorbing materials, geometric designs that scatter reflections away from the source radar, and electronic countermeasures that confuse or jam receiver systems. Quantum radar operates on an entirely different physical principle: it uses entangled photon pairs, where one photon is sent toward the target and the other is retained at the receiver. Because entangled photons share a quantum state regardless of distance, the retained photon provides a reference that allows the system to distinguish the genuine reflection of the sent photon from background noise — even when the reflected signal is billions of times weaker than conventional radar sensitivity thresholds. The system developed at the National University of Defense Technology in China demonstrated the ability to detect targets with radar cross-sections as small as 0.001 square meters — the cross-section of advanced stealth aircraft like the F-35 and B-21 — at ranges exceeding 150 kilometers, with performance unaffected by atmospheric conditions including heavy precipitation that degrades conventional radar. Electronic jamming was also found to be ineffective because the entanglement correlation cannot be mimicked by conventional radio frequency interference. 🌏 Whether this technology reshapes military balance or primarily drives quantum sensing applications in civilian medicine and environmental monitoring, the physics it demonstrated is real and consequential. Source: National University of Defense Technology, China, Physical Review Applied 2025

Never Getting Lost with Quantum 🧭⚛️ Modern navigation relies heavily on Global Navigation Satellite Systems (GNSS) e.g. GPS. But GNSS is vulnerable ⛑️ Its signals come from satellites 🛰️ and can be jammed, spoofed, or blocked, especially in contested or cluttered environments 👿 Quantum navigation offers a resilient alternative. It uses quantum sensors to measure motion 🚀 gravity 🍎 or magnetic fields 🧲 with extreme precision. These systems work without external signals, enabling potentially accurate & resilient navigation. 🟢🟢 The gold standard is a Quantum Inertial Navigation System (INS) with zero external inputs 🦾 It has two main components ⤵️ 🔷 Quantum accelerometers cool atoms such as rubidium to near absolute zero ❄️ At this temperature, atoms behave like waves. In a vacuum, they free fall while being manipulated by lasers ⚡ forming interference patterns 🌈 Acceleration changes the pattern, revealing motion with high precision. 🔷 Quantum gyroscopes operate in a similar way. Cold atoms are split and travel along different paths. When recombined, any rotation shifts the interference pattern 🩰 These devices detect rotations & acceleration with sensitivity orders of magnitude more than classical sensors 🚀 🟢🟢 But Quantum INS remains extremely difficult 😥Quantum magnetometers & gravimeters offers another path 🗺️ 😎 🔷 Quantum magnetometers use atomic spin to detect subtle changes in magnetic fields. Spin is a quantum property associated with magnetism 🧲 not an actual rotation 🌀 Lasers or microwaves probe these states to measure 🧲 field strength & direction with great sensitivity. 🔷 Quantum gravimeters also use cold atoms, but focus on measuring tiny variations in gravitational acceleration, like quantum accelerometers responding to Earth’s pull 🍎 Each point on Earth has a magnetic and gravitational signature that is unique at the tiniest level 🌍 Quantum magnetometers & gravimeters can build maps 🗺️ & compare measurements to 🗺️ Comparing sensor data to these maps enables positioning without GNSS. These fields are fundamental geophysics properties & cannot be jammed or spoofed. This enable resiliency but yet a lower hanging fruit 🍎 than quantum INS 😥 though still challenging❗ 🟢🟢 The physics works, but engineering is the bottleneck 👷🏻♀️ Devices must become smaller & more robust to interference to escape the lab Companies like Q-CTRL are leading the way. Q-CTRL sensors use classical airborne magnetic & gravity maps. Deep learning filters out noise & errors to isolate true signals in real time. In trials, Q-CTRL achieved a drift of only ~0.005 percent of the distance travelled, vastly outperforming classical. SAF C4 & Digitalisation Command (SAFC4DC) must understand & experiment these tech 🧭🗺️ to help guide the way for the defence. Navigation is going Quantum ⚛️ And we are never getting lost 👽 #quantum Met Q-CTRL Michael Biercuk recently & he is doing amazing things with quantum navigation❗

Potential game-changer… Quantum radar is an emerging technology that uses the principles of quantum mechanics to improve the detection capabilities of radar systems. Unlike traditional radar, which relies on classical electromagnetic waves, quantum radar utilizes quantum entanglement and superposition to make objects detectable even in environments where traditional radar might fail, such as in the presence of strong interference or stealth technologies. It has the potential to dramatically improve range, accuracy, and the ability to detect low-profile targets, such as stealth aircraft or small drones. Quantum radar could be a game-changer for military, security, and aviation industries by overcoming the limitations of conventional radar systems. *Key Benefits:* - *Improved Detection of Stealth Objects:* Quantum radar could theoretically "see" through stealth technology, making it much harder for advanced military aircraft and drones to evade detection. - *Enhanced Sensitivity:* Quantum radar can detect faint signals, enabling it to work more effectively in challenging environments with a lot of background noise or interference. - *Future Applications:* Beyond military use, quantum radar may have applications in aviation safety, environmental monitoring, and autonomous vehicles.

Quantum sensing just saved a life on a mountainside in Iran. The CIA used a classified tool called “Ghost Murmur” to locate a downed U.S. airman hiding in a desert mountain crevice — confirmed publicly by CIA Director John Ratcliffe at a White House briefing yesterday. The technology pairs long-range quantum magnetometry with AI to detect the electromagnetic fingerprint of a human heartbeat and isolate it from background noise. According to sources cited by the New York Post, which broke the story, it worked from roughly 40 miles away. This was its first operational use in the field. “It’s like hearing a voice in a stadium, except the stadium is a thousand square miles of desert. In the right conditions, if your heart is beating, we will find you.” The system was developed by Lockheed Martin’s Skunk Works — the same division behind the U-2 and SR-71 — and relies on sensors built around microscopic defects in synthetic diamonds, a core technique in modern quantum magnetometry. This is a meaningful moment…not because the physics behind quantum magnetometry is new, but because it just crossed from classified program to real-world, life-or-death deployment. Quantum sensing is not a future capability. It’s operational. https://lnkd.in/gsMdBBbR

A flood can rise faster than warning systems can respond -- and the difference between minutes and hours can mean thousands of lives. Researchers in Chennai are testing quantum machine learning to increase disaster prediction accuracy to over 95%. Every week, I track the quantum research that’s intended for real-world performance, resilience, and utility. These are early steps, but they point toward where quantum may prove its worth. ⚇ Quantum early warnings for disasters: Researchers from the Chennai Institute of Technology propose a hybrid quantum-classical framework for sudden event prediction. Using quantum neural networks and quantum SVMs, their system achieved 95.8% accuracy on real-world datasets, enabling earlier, more reliable alerts for floods, wildfires, and hurricanes. ⚇ Quantum models for aging health: Teams at Memorial University, Newfoundland and Labrador and Queen's University Belfast created eQLSTML, a model that integrates LSTMs with variational quantum circuits to estimate energy expenditure in older adults from wearable data. On the GOTOV dataset, it outperformed classical baselines, capturing complex temporal patterns with as few as four qubits. ⚇ Smart grids meet quantum twins: Researchers at the University of Quebec and the University of Toronto developed a quantum-enhanced digital twin for future smart grids. They applied QAOA and other quantum modules to improve real-time grid simulation, predictive maintenance, and anomaly detection. If you want these kinds of insights in your inbox every morning, subscribe to the Daily Qubit from The Quantum Insider and never miss a qubit -- link in the comments. #quantumcomputing #quantumsensing #QML

The Department of Defense is eyeing localized quantum sensors as a radical alternative to space-based Global Positioning System satellites in the face of increasing threats to GPS signals needed for precision navigation and timing. In a peer conflict, notes Lt. Col. Nicholas Estep from the Defense Innovation Unit (DIU), “you really must presume a denied and degraded environment in which you cannot rely upon external PNT signals like GPS.” That’s why DIU, the Pentagon’s acquisition outpost in Silicon Valley, is seeking commercial partners to help develop distributed, localized alternatives that don’t rely on easily jammed signals from thousands of miles above the earth’s surface. The military depends on GPS for navigation, timing, and targeting, and industries from transportation to agriculture to banking rely on its precision for a host of purposes. But the wars in Ukraine and the Middle East have exposed how signal jamming and spoofing can deny access to signals from space, forcing users to seek alternatives. “What are we going to do in order to maintain PNT-enabled solutions, to allow the joint force to execute its mission?” asked Estep, whose DIU portfolio includes quantum sensing, hypersonics and advanced materials. DIU solicited industry seeking quantum sensing technology that could augment or back up GPS satellites for military applications within a couple of years. The “project will focus on demonstrating the military utility of quantum sensors to address strategic Joint Force competencies,” DIU said at the time. The supporters of quantum sensing for PNT say it represents a step change, away from the inherently fragile beacon-signal approach of GPS or even eLoran. “The next generation of PNT technologies returns positioning to the local vehicle or individual and it says, essentially, now we want to be able to navigate using only things that we measure locally,” said Michael Biercuk, CEO of Q-CTRL, a quantum technology company. Because the Earth’s magnetic and gravitational fields vary minutely from place to place and because those variations have already been mapped, a tool that can measure those minute variations can accurately locate the user, Biercuk explained. “If you combine a really good map of these geophysical phenomena with a really good local sensor, you can do what we sometimes jokingly refer to as quantum orienteering,” Biercuk said, “You can take your map and your sensor and figure it out where you are.” Full Article: https://lnkd.in/gYthF_72 #PNT #eLORAN #Quantum ARL’s Rydberg quantum sensor experimental apparatus, which was used to sample the radio-frequency spectrum from zero frequency up to 20 GHz and detect real-world communication signals. (Army Research Laboratory)