The United States government is working on finalizing a set of rules designed to limit exports of high-end technology to countries like China, according to Reuters.

The rules, which are still under finalization by the U.S. Commerce Department, are covering technologies and products like quantum computing, artificial intelligence, 3-D printing, transistors and chemicals, according to a document seen by Reuters.

The rules touch a few technologies tailored to address specific national security issues and will be proposed to international bodies before taking effect not before 2021.

The rules would apply to exports of goods from the United States as well as shipments of items made abroad that contain a significant amount of U.S. technology or components.

The U.S. Commerce declined to confirm any details but said it has a number of proposed rules in the review process.

Other rules regulate 3-D printing for explosives, the so called “Gate-All-Around Field Effect transistor technology used to manufacture semiconductors, chemicals used to make Russian nerve agent Novichok and single-use chambers for chemical reactions.

According to the document, the agency also plans to regulate exports of quantum diluted refrigerators, which are used to keep qubits cold in some quantum machines. Qubits are used in quantum computers to perform calculations that would take conventional computers thousands of years.