China’s Quantum Sensing Ecosystem: From Deep-Sea Diamonds to Drone-Mounted Submarine Hunters

This is Article 8 of 10 in the China’s Quantum Ambition Deep Dive series.

Introduction

In April 2025, a team from the University of Science and Technology of China published what might be the most consequential quantum sensing result of the decade — and almost nobody in the Western security community noticed. They had taken a nitrogen-vacancy center diamond magnetometer, packaged it into a ruggedized housing, and lowered it to the floor of the South China Sea aboard the manned submersible Shenhai Yongshi. It worked. Vector magnetic field measurements, in actual deep-ocean conditions, using a quantum sensor.

The same month, a separate Chinese team published peer-reviewed results of a drone-mounted atomic magnetometer tested in offshore trials near Weihai, Shandong. It achieved picotesla-level sensitivity — matching NATO’s MAD-XR magnetic anomaly detection system at lower cost and complexity. The application was unmistakable: hunting submarines.

And a few weeks earlier, aboard the Chinese Space Station, researchers had demonstrated the world’s first cold atom gyroscope to operate in orbit — a technology that, if miniaturized and ruggedized, could provide GPS-free navigation for submarines, missiles, and autonomous vehicles.

Three results, three different quantum sensing modalities, three different teams, all within a few weeks of each other. None of them, individually, represents a deployed military capability. But taken together, they reveal something that deserves far more attention than it has received: China has built the world’s most comprehensive, state-directed quantum sensing program, and it is accelerating.

This article is my attempt to map that program — the companies, the labs, the military applications, the genuine achievements, and the claims that don’t hold up under scrutiny. Because as I’ve argued throughout my analysis of the quantum race, understanding what China is actually doing matters far more than the breathless headlines suggest — but it also matters far more than the skeptics want to admit.

The Least Industrialized Pillar of China’s Quantum Triad

China’s quantum technology program rests on three pillars: quantum communication, quantum computing, and quantum sensing. Of the three, sensing is the paradox. It is the least industrialized — quantum communication generates roughly 60% of China’s quantum industry revenue, and quantum computing is growing fastest — but it may be the most strategically consequential, because its military applications are the most near-term.

As I detailed in my analysis of China’s 15th Five-Year Plan, quantum technology now sits at the #1 position among seven “future industries” designated as new economic growth engines. That elevation, combined with $17.5 billion in new regional venture funds allocated through the National Venture Guidance Fund, signals a shift from research to commercialization. But for sensing specifically, the shift has a dual character: commercial instruments for scientific research on one track, defense and national security applications on a parallel, far less visible track.

The scale of government commitment to quantum sensing specifically is notable. Beijing has issued 13 national-level policy measures supporting quantum precision measurement. The State Council’s Metrology Development Plan (2021–2035) explicitly calls for accelerating R&D of quantum sensors, high-precision atomic gravimeters, and quantum chip applications in metrology. A new RMB 2.2 billion ($310 million) quantum precision measurement research facility was announced in Anhui Province in December 2024 — dedicated infrastructure for sensing rather than computing or communication.

As for the total investment figure, I’ll spare readers the ritual citation of McKinsey’s $15.3 billion estimate. As I detailed in my analysis of why China’s quantum investment is unknowable, that number is unverifiable, disputed by insiders, and surrounded by a confidence interval so wide it is functionally useless. What matters is not the dollar figure but the structural commitment: coordinated national, provincial, and municipal investment flowing through channels that dwarf anything in the West — regardless of whether the total is $4 billion or $25 billion.

CIQTEK: The Quantum Sensing Company the West Hasn’t Heard Of

If you work in quantum computing, you know Origin Quantum, QuantumCTek, and SpinQ. If you work in quantum sensing, you should know CIQTEK — and almost nobody in Western security circles does.

CIQTEK is arguably the world’s broadest-portfolio NV-center diamond instrument manufacturer. Spun out of USTC’s CAS Key Laboratory of Microscale Magnetic Resonance in 2016, it now employs over 700 people and had its STAR Market IPO approved in December 2025 at a $1.6 billion valuation — making it China’s first publicly listed company built primarily on quantum sensing technology.

The product line is striking in its breadth: quantum diamond microscopes capable of wide-field NV-center magnetic imaging at 400nm resolution, scanning NV magnetometers with 10–30nm spatial resolution, single-spin spectrometers with no globally equivalent commercial product, EPR spectrometers, optically pumped magnetometer arrays for cardiac diagnostics, and high-speed pulse generators. No Western company matches this portfolio in a single firm.

More importantly, CIQTEK has moved beyond laboratory instruments to genuine industrial deployment. The company has forged partnerships with CATL and Gotion High-Tech — two of the world’s largest battery manufacturers — for quality control in battery production using quantum diamond magnetic imaging. This is not a research prototype. It is a quantum sensor generating revenue in a manufacturing environment.

CIQTEK also masters the full NV-center supply chain from ultra-pure diamond growth through ion implantation and micro-nano processing. That vertical integration matters for supply chain resilience — a point I’ll return to.

The Defense Giants and the Startup Swarm

Beyond CIQTEK, China’s quantum sensing landscape divides into two categories: defense state-owned enterprises operating with minimal transparency, and a growing swarm of university spinouts.

CETC (China Electronics Technology Group) is the most prominent defense player. Its 14th Research Institute developed the claimed “single-photon quantum radar” that attracted global attention in 2016. The 27th and 38th Institutes contribute to quantum radar and imaging research. CASC (China Aerospace Science and Technology Corporation) produced the drone-mounted submarine-detection magnetometer — the most operationally significant recent result. Its 508 Research Institute has operated a Quantum Sensing Laboratory since 2012. CASIC (China Aerospace Science and Industry Corporation) mass-produces rubidium atomic clocks for BeiDou satellites, including a 17mm super-thin model that represents genuine miniaturization achievement.

The startup layer is thinner but growing:

Guosheng Quantum (founded 2019) markets itself as China’s first company dedicated to industrial quantum sensing, producing NV-center diamond magnetometers deployed with State Grid Anhui Electric Power for power grid monitoring. Kewei Quantum (a Beijing Academy of Quantum Information Sciences spinout) develops Rydberg atom electromagnetic sensors for 6G antenna characterization and military spectrum monitoring — a fascinating dual-use technology. CAS Cold Atom/Zhongke Kuyuan in Wuhan bridges computing and sensing, producing both the 100-qubit Hanyuan-1 neutral atom computer and a portable atomic quantum gravimeter. Taifs Technology in Wuhan mass-produces chip-scale atomic clocks at approximately 2.4 cm³ — described as the world’s smallest — for underwater BeiDou navigation, low-orbit satellites, and drone swarms.

One notable pattern: China’s tech giants are almost entirely absent from quantum sensing. Huawei, Alibaba, Baidu, and Tencent focus on quantum computing cloud platforms. This is a meaningful gap. In the US, SandboxAQ — which spun out of Google’s parent Alphabet — has become one of the most significant quantum sensing companies precisely because it combines AI with quantum sensor data. China has no equivalent.

The Research Powerhouses: Where the Science Actually Happens

China’s quantum sensing research concentrates in a handful of elite institutions, with USTC in Hefei dominating overwhelmingly. Understanding the institutional landscape matters because in China’s system, the line between academic research and defense application is porous by design.

USTC’s CAS Key Laboratory of Microscale Magnetic Resonance, led by Academician Du Jiangfeng, is China’s foremost NV-center diamond sensing group. Du’s team produced the deep-sea diamond magnetometer demonstrated on Shenhai Yongshi, single-molecule magnetic resonance spectroscopy, and a landmark 2024 Review of Modern Physics paper that established Chinese authority in nanoscale NMR. CIQTEK is Du’s commercial spinout. Separately, USTC achieved a strontium optical lattice clock with uncertainty of 9.2×10⁻¹⁹ in early 2026 — among the most precise clocks ever built on Earth.

The CAS Innovation Academy for Precision Measurement Science and Technology in Wuhan, led by Ming-Sheng Zhan, operates China’s premier cold atom facility. Zhan runs the ZAIGA project — a massive underground installation near Wuhan with 1-km-arm equilateral triangle atom interferometers, a 300-meter vertical tunnel, and optical lattice clocks, at a cost of approximately 2 billion yuan. His team achieved the space-based cold atom gyroscope aboard the Chinese Space Station in 2025.

The National Time Service Center in Xi’an, led by Chang Hong, developed China’s most precise optical lattice clock for metrology — the NTSC SrII, with systematic uncertainty of 1.96×10⁻¹⁸, making China the second nation after the US to meet key benchmarks for redefining the SI second. Huazhong University in Wuhan, under Hu Zhongkun, developed a transportable atom gravimeter with 3 μGal combined uncertainty that has participated in international comparison campaigns. NUDT (National University of Defense Technology) conducts classified and semi-classified work on quantum navigation and inertial sensing for the PLA.

Other notable centers include the Zhejiang Lab (dedicated Research Center for Quantum Sensing pursuing quantum inertial navigation and life sciences) and Shanghai Jiaotong University (Quantum Sensing and Information Processing Center, one of China’s oldest quantum sensing groups, founded 2001).

The numbers tell a story of their own: according to the ITIF’s September 2024 assessment, China produces 24.5–26% of global quantum sensing publications, versus 15.4% for the United States. In research quality, the gap has nearly closed — China’s share of top-10% cited papers stands at 23.3% versus the US at 23.7%. In patents, China holds approximately 60% of all quantum technology patents globally. But that dominance is almost entirely at the Chinese patent office — no Chinese entity appears in the top 10 for international quantum sensing patent families. This suggests a strategy prioritizing domestic IP protection for national security rather than global commercial positioning.

Military Applications: Separating Signal from Noise

This is where the analysis gets hardest and where it matters most. China’s quantum sensing military applications span a spectrum from verified achievements to unsubstantiated claims, and conflating the two — in either direction — serves nobody well.

Quantum Radar: Not What the Headlines Suggest

CETC’s 2016 announcement of a “single-photon quantum radar” with 100 km detection range generated enormous excitement and alarm. But as I detailed in my analysis of quantum radar technology, Western analysts overwhelmingly assess that this is an advanced photon-counting lidar/radar — not true quantum illumination radar.

True quantum illumination requires entangled microwave photons, quantum memory, and joint signal-idler measurement at room temperature — challenges no nation has solved. RAND’s Edward Parker told the USCC in 2024 that the U.S. military had publicly identified quantum radar as impractical. The PLA’s Equipment Development Department has funded quantum radar projects at approximately 500,000 RMB each (~$75,000) — modest sums suggesting early-stage research rather than deployment programs.

An operationally useful quantum radar capable of detecting stealth aircraft remains 15–25+ years away for any nation. The claims about China mass-producing quantum radar detectors, while attention-grabbing in South China Morning Post headlines, should be understood as referring to advanced classical photon-counting systems with “quantum-enhanced” marketing — not the entanglement-based quantum radar that would genuinely change the stealth calculus.

Submarine Detection: The Real Military Concern

If quantum radar is overhyped, quantum-enhanced submarine detection is underhyped. Three distinct magnetometer technologies are converging toward anti-submarine warfare capability, and this is where I see the most operationally significant near-term military application of quantum sensing.

CASC’s drone-mounted CPT atomic magnetometer, tested in offshore trials near Weihai in April 2025, achieved picotesla sensitivity matching NATO’s MAD-XR system — while eliminating the low-latitude blind zones that plague traditional magnetic anomaly detection sensors in the South China Sea. That last point matters enormously: conventional MAD systems lose effectiveness near the equator due to the geometry of Earth’s magnetic field. The South China Sea, where any future naval confrontation between China and the US would most likely occur, is precisely where this limitation bites hardest.

A simplified SQUID magnetometer design published in late 2023 achieved 10× better sensitivity than predecessors using a single superconducting magnetic gradiometer, and was described as deployable on drone fleets at scale.

And Du Jiangfeng’s NV-center diamond magnetometer, tested on the Shenhai Yongshi submersible, demonstrated that quantum vector magnetometry works in real ocean environments — not just laboratory tanks.

Three modalities — CPT atomic, SQUID, and NV-center diamond — three parallel paths to quantum-enhanced ASW capability. None is confirmed deployed on operational PLA platforms. But the convergence of multiple complementary approaches, the shift from laboratory demonstrations to sea trials, and the explicit peer-reviewed publication of results suggest a program that is 3–7 years from initial operational capability.

For context on the strategic implications of quantum sensing for navigation and sovereignty, submarine detection represents arguably the most destabilizing military application of quantum technology — more immediately consequential than a cryptographically relevant quantum computer, because it threatens the survivability of nuclear submarine forces that underpin strategic deterrence.

Quantum Navigation: Space-Demonstrated, Submarine-Distant

The 2025 demonstration of a cold atom gyroscope aboard the Chinese Space Station — the first in orbit anywhere — validated China’s atom interferometry capabilities for GPS-denied navigation. NUDT is actively developing what it calls “new generation inertial navigation” using quantum effects.

But submarine deployment faces severe engineering challenges that the space demonstration does not resolve: vibration isolation on a moving vessel, miniaturization to fit submarine compartments, dead-time during atom cooling cycles, and sensitivity to platform motion. US government estimates suggest cold atom interferometers could work in operational conditions by 2029; submarine deployment is likely 5–10 years further out.

Space-Based Quantum Sensors: A Genuine Lead

BeiDou’s domestically developed hydrogen maser clocks achieve approximately 1 femtosecond per day uncertainty — reportedly an order of magnitude more stable than GPS rubidium/cesium clocks. The Chinese Space Station hosts a cold atom microwave clock with accuracy claimed to be five orders of magnitude better than BeiDou satellite clocks. A compact strontium optical lattice clock system has been demonstrated in orbit. These are verified, operationally deployed capabilities that give China a genuine edge in precision timing — with implications for both civilian infrastructure and military operations that rely on precise time synchronization.

Ghost Imaging: File Under “Watch, Don’t Worry”

CAS Shanghai’s Key Laboratory for Quantum Optics has been developing ghost imaging satellites since at least 2017, with ground-based demonstrations achieved. Claims of detecting stealth aircraft or enabling facial recognition from 100 km orbit should be treated as aspirational. Space-based ghost imaging faces enormous practical challenges with photon budgets and atmospheric interference. This is worth monitoring but should not drive procurement decisions.

The Privacy and Ethics Dimension

It would be remiss not to note that many of these quantum sensing capabilities — whether deployed by China or any other nation — raise profound ethical and privacy questions. Quantum magnetometers capable of detecting neural activity, gravimeters that can map underground structures from the surface, and persistent wide-area magnetic surveillance networks all have surveillance implications that extend well beyond the military domain. China’s deployment of these technologies within its own borders, particularly in the context of its existing surveillance infrastructure, deserves attention from human rights organizations and policymakers alike.

How China Compares: Leading in Volume, Trailing in Deployment

The ITIF’s September 2024 assessment captures the competitive dynamic well: China matches the United States in sensing, excelling in market-ready lab instruments, while the United States dominates in high-impact deployed systems and miniaturization.

China leads in publication and patent volume, NV-center diamond commercial instruments (CIQTEK’s portfolio is unmatched globally), single-photon detector manufacturing (mass production began October 2025), space-based quantum sensors, and sheer government investment commitment.

China trails in optical clock absolute precision (JILA/University of Colorado still holds records, though China is closing rapidly), miniaturization and ruggedization of field sensors (US companies Infleqtion, AOSense, and Vector Atomic lead in portable quantum inertial sensors), AI-integrated quantum sensing software (SandboxAQ’s AQNav has no Chinese equivalent), and private-sector ecosystem depth. The UK demonstrated the first quantum gravity gradiometer field measurement detecting underground structures (University of Birmingham, Nature 2022). France’s Exail (formerly Muquans) leads in commercial atom gravimeters.

The funding asymmetry tells a story of different strategic approaches. Chinese quantum startups raised only $44 million in sensing-specific deals versus the billions flowing into US quantum companies like SandboxAQ’s $450 million Series E and Infleqtion’s $1.8 billion SPAC. But Chinese public investment dwarfs US government spending through the National Quantum Initiative. As I explored in Quantum Sovereignty, these are not just different funding levels — they are different theories of how quantum technology advances, with China betting on coordinated state direction and the US betting on market-driven innovation. Neither approach has proven clearly superior, and quantum sensing may be the domain where that contest is decided.

Export Controls Are Accelerating, Not Constraining, China’s Supply Chain

A RUSI analysis from June 2025 reached a conclusion that should give Western policymakers pause: US export controls have paradoxically accelerated China’s domestic quantum supply chain development. The quantum supply chain’s relative shallowness compared to semiconductors makes it, in RUSI’s assessment, “more feasible to innovate around restrictions.”

China has built strong domestic capability in single-photon detectors (mass production of four-channel ultra-low-noise SPDs began October 2025), NV-center diamond substrates (CIQTEK masters the full chain), narrow-linewidth lasers (Precilaser in Shanghai exports to Harvard and other Western labs), and control electronics. The primary remaining vulnerability — dilution refrigerators, previously dominated by Finland’s Bluefors and UK’s Oxford Instruments — is being addressed by over 10 Chinese manufacturers that have emerged since restrictions tightened. China’s control of 69% of global rare earth reserves and 90% of processing represents a leverage point rather than a vulnerability.

For quantum sensing specifically, the supply chain challenge is somewhat different from quantum computing. Many quantum sensors — atomic clocks, magnetometers, gravimeters — operate at room temperature or modest cooling requirements, avoiding the cryogenic bottleneck entirely. NV-center diamond sensors require synthetic diamond substrates and precision laser systems, both of which CIQTEK produces domestically. The components that remain challenging are specialized vacuum systems for cold atom sensors and certain ultra-stable laser cavities — but these are areas where China’s capacity is growing rapidly.

What to Watch: The Three Developments That Will Matter Most

If I had to identify the three developments over the next 2–5 years that will most significantly reshape the quantum sensing competitive landscape, they would be:

First, whether CIQTEK’s IPO catalyzes a broader quantum sensing investment cycle in China. CIQTEK’s $1.6 billion valuation creates a benchmark and an exit pathway that China’s quantum sensing startup ecosystem has lacked. If Guosheng Quantum, Kewei Quantum, and others can attract significantly more private capital in CIQTEK’s wake, the commercialization gap between China and the West will narrow rapidly.

Second, whether China’s submarine-detection magnetometers move from sea trials to fleet deployment. The convergence of three complementary modalities (CPT, SQUID, NV-center) gives China multiple paths to quantum-enhanced ASW. The first confirmed deployment on an operational PLA Navy platform — whether on surface vessels, maritime patrol aircraft, or underwater drones — will be a strategic inflection point that materially affects the nuclear deterrence balance in the Western Pacific.

Third, whether China achieves practical quantum inertial navigation for submarines. The space-based cold atom gyroscope is an impressive demonstration, but the engineering challenges of submarine deployment are formidable. If China fields a quantum inertial navigation system capable of providing strategic-grade accuracy without GPS for days or weeks, it would dramatically enhance the survivability of China’s submarine-launched nuclear deterrent — with cascading implications for quantum sensing and navigational sovereignty globally.

The Bottom Line

China has constructed the most comprehensive state-directed quantum sensing program in the world. That is not hype. Nor, however, is it the same as saying China leads in quantum sensing — it doesn’t, not across the board. The US maintains advantages in miniaturization, deployed systems, and AI integration. The UK and France lead in specific sensing modalities. Australia punches far above its weight in quantum sensing research.

What China has is something different: the most systematic effort to pursue quantum sensing across every modality simultaneously — clocks, magnetometers, gravimeters, gyroscopes, accelerometers, radar, lidar, imaging — with dedicated state funding, institutional infrastructure, and explicit military-civil fusion mandates that blur the line between laboratory research and defense capability.

The most important uncertainty remains the gap between demonstrations and deployment. China’s quantum radar claims remain unverified. Quantum navigation for submarines is years from readiness. Many of the 404 quantum companies tracked in Chinese registries may exist primarily to capture government subsidies rather than deliver products. The USCC’s November 2025 report observed that Chinese quantum breakthroughs often lack independent verification, blurring the line between genuine progress and political signaling — a caution that applies most acutely to defense sensing applications.

But the trajectory is unmistakable. And as I’ve argued throughout this China quantum series, the pattern of state prioritization followed by scaled investment followed by rapid commercialization has repeated across solar, EVs, 5G, batteries, and high-speed rail. Whether quantum sensing will follow the same trajectory depends on whether the engineering challenges prove as tractable as those in manufacturing — a genuinely open question.

What is not open to question is that China is trying. Harder, more systematically, and with more resources than anyone else. Whether that effort succeeds will shape not just the military balance of the 2030s, but the ethical and strategic landscape of precision sensing for decades to come.

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