Shulou(Shulou.com)11/24 Report--

Thank you, Mr. Air, a netizen of CTOnews.com, for your clue delivery! CTOnews.com, March 23, CTOnews.com learned from official account of Shenzhen Institute of Quantum Science and Engineering that recently, under the leadership of Academician Yu Dapeng, the research team of Xu Yuan, assistant researcher of Superconductor Laboratory of Shenzhen Institute of Quantum Science and Engineering, joined hands with Professor Zheng Shibiao of Fuzhou University and Professor Sun Luyan of Tsinghua University to overcome difficulties and made great breakthroughs in quantum error correction based on superconducting quantum circuit systems. The joint team extends the storage time of quantum information through real-time repetitive quantum error correction technology, surpasses the break-even point for the first time in the world, and shows the advantages of quantum error correction. This milestone represents a key step towards practical and scalable universal quantum computing. Relevant academic articles were published on the website of the well-known international academic journal Nature on the 23rd Beijing time.

Image source Pixabay

Although the research in the field of quantum information processing based on superconducting quantum circuit system has made rapid progress in recent years, the error rate of quantum computer system is much higher than that of classical digital computer. if you want to build a general-purpose quantum computer with practical value, quantum error correction is necessary, because quantum error correction can effectively protect quantum information from the interference of noise in the environment.

The traditional quantum error correction scheme needs multiple redundant physical bits to encode a logical qubit, which not only requires a huge cost of hardware resources, but also the number of channels where errors occur will significantly increase with the increase of the number of bits. there may be an awkward situation of "more and more errors". Although this quantum error correction scheme has had a number of demonstrative experimental research work, it still can not solve the problem of "more and more errors" in the process of quantum error correction, and does not really exceed the break-even point, that is to say, the effect of quantum error correction is far from the best value in the case of no error correction in the system, and can not really produce positive quantum error correction gain. This is also the core bottleneck that the current quantum error correction technology can not be practical and scalable.

Figure 1. In order to overcome the above problems, the joint research team uses the infinite dimensional Hilbert space in the microwave harmonic oscillator or Bose mode system to realize the redundant coding and quantum error correction of quantum information. In the superconducting quantum circuit system, the quantum error correction scheme based on Bose coding has the advantages of simple error type, convenient error detection, good coherence, more efficient hardware and easy feedback control. In this research work, by developing quantum systems with high coherent performance, designing and implementing error symptom detection methods with low error rate, and improving and optimizing quantum error correction techniques, the research team finally realizes the logical qubits encoded by binomial based on discrete variables in Bose mode, and prolongs the storage time of quantum information through real-time repetition of quantum error correction process. For the first time, the relevant results exceed the best value without error correction in the system, that is, break through the break-even point. This is also the first time in the world to extend the storage time of quantum information beyond the break-even point through active repetitive error detection and error correction, which is of great significance.

Fig. 2 Experimental characterization of quantum error correction operation

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