Nvidia chips do not contain "backdoors" allowing remote access, the US tech giant has said, after Beijing summoned company representatives to discuss "serious security issues".

The California-based company is a world-leading producer of AI semiconductors, and this month became the first company to hit $4 trillion in market value.

But it has become entangled in trade tensions between China and the United States, and Washington effectively restricts which chips Nvidia can export to China on national security grounds.

"Cybersecurity is critically important to us. Nvidia does not have 'backdoors' in our chips that would give anyone a remote way to access or control them," Nvidia said in a statement Thursday.

A key issue has been Chinese access to the "H20" -- a less powerful version of Nvi

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