US-China tech war: Beijing's secret chipmaking champions

Once a month, senior executives of Yangtze Memory Technologies Co. fly to Beijing for a flurry of meetings with China's top economic management bodies. They focus on the company's efforts to build some of the world's most advanced computer memory chips -- and its progress on weaning itself off American technology.

Based in the central riverside city of Wuhan, Yangtze Memory is considered at the vanguard of the country's efforts to create a domestic semiconductor industry, already mass-producing state-of-the-art 64-layer and 128-layer NAND flash memory chips, used in most electronics from smartphones to servers to connected cars.

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