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可重构光学算术逻辑单元芯片研制成功_我的网站

A |     London, Oct 20 (UNI) A chaotic day in Parliament has left Prime Minister Liz Truss's survival even more uncertain after the sudden resignation of her Home Secretary and angry scenes during a fracking vote in the Commons.
Opposition MPs alleged some Tories were bullied and manhandled into voting with the government on fracking.
A Minister denied the claim but many Tory MPs ended the day feeling angry and let down by their own party.
Conservative MP Charles Walker said the situation was a "shambles". Visibly furious, he told the BBC there was "no coming back" for the government.
Later he added: "I expect the Prime Minister to resign very soon because she's not up to her job."
Downing Street started on Wednesday believing the Prime Mnister was on a more solid footing after the appointment of Jeremy Hunt as Chancellor -- and his decision to reverse much of Truss's mini-Budget -- appeared to have calmed the markets.
She also survived Prime Minister's Questions -- the weekly question session with MPs -- relatively unscathed.
However, things began to unravel for Truss shortly afterwards.
It seems near impossible that this chaos can be bottled and buried. An implosion feels unavoidable, perhaps imminent, the BBC reported.
The dysfunction is too profound, the outrage among Conservatives too deep-seated for any sense of serenity to be established for as long as Liz Truss is Prime Minister.
Those still supportive of her point out that finding an alternative Prime Minister quickly is difficult and even if this was pulled off, it would be seen as absurd to many around the country.
And so the clamour for a general election would be deafening.
The Prime Minister was forced to hastily cancel a visit to an electronics manufacturer in order to have a meeting with Suella Braverman after her Home Secretary broke government data rules.
The BBC has been told Ms Braverman breached the ministerial code by sending a government document to someone not authorised to receive it.
In her resignation letter, Braverman acknowledged there had been "a technical infringement of the rules". She added: "I have made a mistake; I accept responsibility: I resign."
However, she also took an angry swipe at the government by accusing it of breaking "key pledges" and failing to reduce immigration numbers.
Her departure makes Braverman the shortest-serving Home Secretary since World War II -- and comes less than a week after the resignation of Kwasi Kwarteng as Chancellor.
Grant Shapps -- who Truss had sacked as Transport Secretary six weeks ago -- became the new Home Secretary.
Shortly after Mr Shapps arrived at the Home Office to start his new job, chaotic scenes began to play out in the Commons, where MPs were voting on fracking.
Labour had tabled a vote which, if passed, would give MPs a say on the government's plans to bring back fracking.
Labour MP Chris Bryant claimed some Conservative MPs had been physically manhandled in the voting lobbies to ensure they supported the government.
Business Secretary Jacob Rees-Mogg also said he would not characterise the events as bullying.
Former Brexit minister Lord David Frost - once an ally of Truss - has called on the Prime Minister to go.
He added: "The Truss government messed things up more badly than anyone could have imagined."
UNI MR。      记者24日从兰州大学获悉，该校物理科学与技术学院田永辉教授团队在光学数字计算领域取得重要进展。该团队研制出一种可重构光学算术逻辑单元芯片，将多种逻辑与算术运算集成于同一硬件平台。相关成果发表于国际权威期刊《自然·通讯》。  随着人工智能与数据密集型应用对高速、低时延计算需求的激增，传统电子集成电路正面临摩尔定律放缓、互连带宽受限和功耗持续上升等挑战。集成光子技术凭借大带宽、高速并行处理和低传输时延等优势，为突破电子计算瓶颈提供了重要的技术路径。

B |   基于这一背景，研究团队依托成熟的硅光子集成平台，利用微环调制器体积小、调制速度快、功耗低且易于电控重构的特点，研制出可实现多种逻辑与算术功能动态切换的光学数字计算芯片。团队通过级联微环构建基本逻辑单元，实现了NOT、AND、OR、XOR和XNOR等多种逻辑运算；同时引入波长维度并行处理不同二进制位，使同一硬件架构能够动态切换为2比特加法器、减法器和数值比较器，无需重新设计芯片结构。  芯片基于220纳米硅绝缘体平台制备，每个微环集成载流子耗尽型高速电光调制结构和热调谐单元，可分别完成高速数据加载与工作波长校准。实验结果表明，该系统在20Gbit/s速率下实现了基本逻辑运算及算术功能，计算密度达到528Gbit/s2，能效达12.36fJ/bit。  在此基础上，团队完成了高速数据加密与解密、医学图像水印嵌入和图像差异增强等应用验证，展示了该架构从基础逻辑器件向多功能光学数字计算系统扩展的能力。  田永辉表示，该工作为构建高密度、低功耗、可重构的光子算术逻辑处理芯片提供了新的实现路径，也为光学数字计算在高速信息处理和片上智能计算中的应用奠定了器件基础。（记者颉满斌 通讯员余若怡）。

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