![]() ![]() The team's results were published at the 28th IEEE International Symposium on High-Performance Computer Architecture (HPCA-28) to be held from April 2, 2022. ![]() Our results improve the scalability of superconducting quantum computers and fault-tolerance of superconducting qubits, which contribute to the development of fault-tolerant quantum computers. This is accomplished while satisfying the required levels of power consumption, implementation scale, speed, and error correction performance in cryogenic environments to control a practical large-scale quantum computer. For that, it would be nice to work with semiconductor industry groups capable of manufacturing silicon-based quantum devices at a large scale.Professor Masaaki Kondo and Visiting Research Fellow Yosuke Ueno (regular affiliation: Graduate School of Information Science and Technology, The University of Tokyo) from the Keio University Faculty of Science and Technology Yasunari Suzuki, a researcher at NTT Computer and Data Science Laboratories Assistant Professor Masamitsu Tanaka of the Graduate School of Engineering, Nagoya University Yutaka Tabuchi, a unit leader at RIKEN Center for Quantum Computing have developed the world's first quantum correction algorithm capable of decoding not only single logical qubits but also multiple interacting logical qubits. We are very happy to have achieved this.”Īccording to Seigo Tarucha, the leader of the research group, “Our next step will be to scale up the system. Quantum error correction is a critical technique for transitioning from noisy intermediate-scale quantum devices to fully fledged quantum computers. They achieved this by implementing a three-qubit Toffoli-type quantum gate.Īccording to Kenta Takeda, the first author of the paper, “The idea of implementing a quantum error-correcting code in quantum dots was proposed about a decade ago, so it is not an entirely new concept, but a series of improvements in materials, device fabrication, and measurement techniques allowed us to succeed in this endeavor. In the current research, conducted by researchers at the RIKEN Center for Emergent Matter Science and the RIKEN Center for Quantum Computing, the group achieved this feat, demonstrating full control of a three-qubit system (one of the largest qubit systems in silicon), thus providing a prototype for the first time of quantum error correction in silicon. Researchers have previously demonstrated control of two qubits, but that is not enough for error correction, which requires a three-qubit system. Here, we report a reset protocol that returns a qubit to the. However, one major problem with the silicon-based technology is that there is a lack of technology for error connection. The effects of leakage and its mitigation during quantum error correction remain an open question. Silicon-based quantum technology, which has only begun to be developed over the past decade, is known to have an advantage in that it utilizes a semiconductor nanostructure similar to what is commonly used to integrate billions of transistors in a small chip, and therefore could take advantage of current production technology. ![]() Some of the popular systems today include superconducting circuits and ions, which have the advantage that some form of error correction has been demonstrated, allowing them to be put into actual use albeit on a small scale. Different candidate systems have their own strengths and weaknesses. One important challenge today is choosing what systems can best act as “qubits”-the basic units used to make quantum calculations. However, because they are designed in a completely different way, they are very sensitive to environmental noise and other issues, such as decoherence, and require error correction to allow them to do precise calculations. They use a completely different architecture, using superimposition states found in quantum physics rather than the simple 1 or 0 binary bits used in conventional computers. Quantum computers are a hot area of research today, as they promise to make it possible to solve certain important problems that are intractable using conventional computers. ![]()
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