Henry Quentir 9/27/26 Henry Quentir 9/27/26

s Slew: Subway Trains, a G4 Storm and a Buried Magnet, Acta Physica Sinica, September 2026

Wang Xin, Jiang Min and Peng Xinhua of the University of Science and Technology of China, with a China State Shipbuilding navigation laboratory as co-author, report in Acta Physica Sinica a rubidium quantum magnetometer whose 7 cubic centimeter probe reaches 10 pT/√Hz, tracks field changes of 25,200 nT/s and relocks by itself in under a second. We read its three field tests, the June 1, 2025 G4 storm against INTERMAGNET's Cheongyang station, two subway trains above a station and a magnet buried half a meter deep, as defense-specific capability: what a motion-tolerant palm-sized sensor changes for magnetic anomaly detection and magnetic navigation, who gains under the dual-use reading, and the moving-platform trial that still stands between the paper and a program office.

The Post-Quantum Migration Reaches the Silicon Layer

In one August week, a Wuhan university team released a 28-nanometer post-quantum cryptography chip with a naval research institute in the room, and a Canada-Taiwan consortium validated a compute-in-memory rival for the same NIST algorithms. A close look at what a hardware root of trust means for forces whose platforms outlive their ciphers, and at the evaluation gates still standing between both chips and a program office.

China Is Willing a Quantum Industry Into Existence

Two ChinaTalk essays by Elias X. Huber, written eighteen months apart, bracket the sharpest question in quantum geopolitics: what happens when outbound investment controls wall off a sector that never needed American money. In H1 2026 China's quantum sector logged 44 financing rounds against 8 a year earlier, and the industrial machinery now spinning up is aimed at future cryptanalytically relevant quantum computers.