Japan has just been put in the career of quantum computers. And he has done it with his own technology

China and the US are the countries that are dedicating more resources to the development of Quantum technologies. And also those who are reaching The most relevant achievements. However, no advanced country can afford to remain out of a technology with An indisputable rupturist potential in the medium term. In this field Japan is adopting a discreet position, but its contributions, although they are not as numerous as those of the other two countries that I have mentioned in this paragraph, are also very important.

In 2023 a group of researchers from the Riken Center for Quantum Computing, in Japan, led by Professor Keisuke Fujii He devised a very advanced algorithm which dramatically reduces the computational complexity of some quantum procedures. His work was published in the scientific journal Physical Reviewand even today is the best available tool to efficiently reproduce the atomic level interactions that take place in some complex materials.

The protocol designed by these Japanese scientists manages to deal with temporary evolution operators in a much more efficient way than the technique used so far, which is known as trotterization. In broad strokes these operators are numbers matrices that describe the very complex interactions that take place in quantum materials. In addition, the algorithm devised by Fujii and his colleagues is a hybrid solution that combines quantum and classic protocols, and has the ability to allow relatively simple quantum computers, such as those we have now, face very complicated problems.

The Riken and Fujitsu center have made a quantum computer of 256 cubits

Today, just a few hours ago, the Riken Center for Quantum Computing and Fujitsu They have announced which have developed in a joint project a superconductor quantum computer equipped with 256 cubits. A priori may not seem like a great achievement if we are in mind that IBM already has a condora superconductor quantum processor of 1,121 cubits, and also The Heron platform (5k) endowed with error mitigation. And the China Telecom Quantum Group (CTQG) and the Center for Excellence in Quantum Information and Quantum Physics of the Chinese Academy of Sciences have developed The Xiaohong quantum processor of 504 superconductor cubits.

However, the implementation of this Japanese machine deserves to be considered an undoubted success if we take into account that it uses technologies developed entirely in Japan. It does not use the hardware designed by IBM or Intel, which is what some research centers disseminated by Europe have done. One of the most attractive tricks of this Japanese quantum computer is that it allows Efficient scalar the cubits number No need to completely redesign all the architecture of the machine.

In addition, the dilution cooling system used is, according to Fujitsu, more efficient than the solutions usually used in other quantum computers. This statement is credible because this 256 cubits machine works properly with the same cooling unit as the previous 64 -cubites quantum computer of the Riken center. It sounds very good. However, this is not all. The plan of the creators of this quantum machine is to have a computer of 1,000 cubits ready in 2026. If Japan get it, it will be placed in this field just one step from the US and China.

Image | Fujitsu

More information | Fujitsu

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