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Still, in 2019 Wilson and colleagues demonstrated that they could generate entangled microwaves and use them to detect an object within the same cryostat, as they reported in March 2019 in Applied Physics Letters.

Among the components being assembled is the 30-metre-diameter cryostat, manufactured by India, which surrounds the reactor and keeps it at the extremely low temperature required.

Superconducting qubits need to be cooled to near absolute zero, in a device called a cryostat that fills a small room.

ScienceInsider spoke with Bigot this week as the cryostat base still hovered over the tokamak pit on the end of a crane.

But the cryostat was not ready to be closed.