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    图片:大卫·雷登

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校正量子器件的“抖动”

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新的研究表明,以更有效的纠错,这可能有助于量子计算机和传感器更实际的路径。


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卡尔·莉迪·让·巴蒂斯特
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A new approach developed by researchers at MIT could provide a significant step forward in quantum error c要么rection. The method involves fine-tuning the system to address the kinds of noise that are the most likely, rather than casting a broad net to try to catch all possible sources of disturbance.

该分析是在该杂志描述 物理评论快报,在由bt365手机app的研究生大卫·雷登,陈墨博士后,以及核科学与工程Cappellaro保拉教授的论文。

“The main issues we now face in developing quantum technologies are that current systems are small and noisy,” says Layden. Noise, meaning unwanted disturbance of any kind, is especially vexing because many quantum systems are inherently highly sensitive, a feature underlying some of their potential applications.

The quantum system they’re w要么king with consists of carbon nuclei near a particular kind of defect in a diamond crystal called a nitrogen vacancy center. These defects behave like single, isolated electrons, and their presence enables the control of the nearby carbon nuclei.

But the team found that the overwhelming majority of the noise affecting these nuclei came from one single source: random fluctuations in the nearby defects themselves. This noise source can be accurately modeled, and suppressing its effects could have a maj要么 impact, as other sources of noise are relatively insignificant.

“真正了解我们在这些系统中删除的噪音以及主要来源,”雷登说。 “因此,我们不必广泛撒网捕捉每一种类型的假想噪音”。

The team came up with a different error correction strategy, tailored to counter this particular, dominant source of noise. As Layden describes it, the noise comes from “this one central defect, 要么 this one central ‘electron,’ which has a tendency to hop around at random. It jitters.”

抖动,反过来,是由那些附近核觉得,在这可以纠正一个可预测的方式。

“我们的做法的结果是,我们能够得到使用更少的资源比否则会被需要保护的一个固定的水平,”我说。 “我们可以用更小的系统,这种有针对性的方法。”

“这是使用时可能会在许多方面的组成部分,”雷登说。 “就好像我们正在开发的发动机的重要组成部分。我们仍然从建筑到全车的方式,但我们已经取得的一个重要组成部分的进步。“

"Quantum error correction is the next challenge for the field," says Alexandre Blais, a professor of physics at the University of Sherbrooke, in Canada, who was not associated with this work. "The complexity of current quantum error correcting codes is, however, daunting as they require a very large number of qubits to robustly encode quantum inf要么mation."

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这项研究是由美国支持陆军研究办公室和美国国家科学基金会。


主题: 学生们, 研究, 研究生,博士后, 工程学院, 核科学与工程, 量子计算, 电子研究实验室, 纳米科学和纳米技术, 美国国家科学基金会(NSF)

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