Fujitsu, Riken show 256qubit quantum computer
The Riken research centre in Japan has scaled up its 64qubit superconducting quantum computer to create a machine with 256qubits in the same footprint. This is part of the roadmap to a machine with 1000 qubits next year.
Riken used four of the existing 64bit superconducting quantum processors built by Fujitsu with a 3D interconnect that fits the four chips and interconnect in the same dilution fridge as the previous machine.
This addresses one of the major challenges of scaling up quantum computer systems and allows the implementation and demonstration of sophisticated error correction algorithms. The two are working on the development of a machine with 1000qubits for next year, and have extended their collaboration to 2029.
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Both Riken and Fujitsu will offer the machine as part of a hybrid quantum computing system for companies and research institutions globally this quarter. The next stage is to use the machine for more sophisticated hybrid algorithms that combine the best attributes of both quantum and classical high performance computer systems. Riken hosts the world’s most power HPC supercomputer, Fugaku, with processors built by Fujitsu, and is working on the next generation architecture with 2nm chips.
Fujitsu and Riken’s 256qubit superconducting quantum computer overcomes some key technical challenges, including appropriate cooling within the dilution refrigerator which is achieved through the incorporation of high-density implementation and cutting-edge thermal design. This thermal design carefully balances heat generation from control circuits with the cooling capacity of the refrigerator, while maintaining the necessary ultra-high vacuum and extremely low temperatures.
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