量子电脑利用量子力学的叠加与纠缠特性，能够以指数级速度超越传统电脑处理复杂问题。与传统位元只能表示0或1不同，量子位元（qubit）可同时处理多种状态，使其在模拟分子行为、金融预测及人工智慧等领域展现巨大潜力。谷歌的Willow量子处理器曾在五分钟内解决了传统超级电脑即使从宇宙诞生之初运算至今也无法完成的问题，标志著量子计算迈向实用化的重要里程碑。
目前全球多家科技巨头与新创公司正积极投入量子电脑的研发竞赛。D-Wave于2011年率先销售量子电脑，IBM、谷歌、亚马逊及微软等企业也相继推出可运作的量子系统。微软在2025年宣布利用马约拉纳粒子制造出更稳定的量子位元。英特尔则开始向研究人员交付矽基量子晶片，其量子位元体积比其他类型小达百万倍。谷歌与IBM等公司宣称将在本十年末交付实用的量子超级电脑。
美国、欧洲与中国正在量子技术领域展开激烈竞争，各国政府纷纷投入巨资。中国设立了百亿美元的量子资讯科学国家实验室，美国总统签署行政命令加速量子技术发展，欧盟筹措50亿欧元基金支持量子新创企业，英国承诺投入逾10亿英镑进行研究。然而量子电脑也带来隐忧，其强大的运算能力可能轻易破解现有加密系统，各国政府与企业已开始投入大量资源保护传统计算系统免受量子威胁。
Quantum computers exploit the principles of superposition and entanglement in quantum mechanics to solve complex problems exponentially faster than classical machines. Unlike classical bits limited to 0 or 1, qubits can process multiple states simultaneously, offering transformative potential in drug development, financial modeling, and artificial intelligence. Google's Willow processor demonstrated this power by solving in five minutes a problem that would have been impossible for traditional supercomputers even given the entire age of the universe.
A global race to build practical quantum computers is well underway among major technology companies and startups. D-Wave became the first to sell quantum computers in 2011, followed by IBM, Google, Amazon, and Microsoft, which announced a breakthrough using Majorana particles to create more stable qubits in 2025. Intel has begun shipping silicon-based quantum chips with qubits up to one million times smaller than competing designs. However, significant challenges remain: qubits are inherently error-prone, and scientists estimate that millions or even billions of qubits will be needed for reliable commercial applications, while the current record stands at only 6,100 connected qubits.
The United States, Europe, and China are competing fiercely for quantum supremacy, with governments committing billions in funding. China established a $10 billion national laboratory, the US signed executive orders to accelerate quantum development, the EU is raising a €5 billion fund for quantum startups, and the UK pledged over £1 billion for research. Beyond economics, quantum advances in sensing and navigation could reshape global military power. Yet quantum computing also poses a serious cybersecurity risk, as its immense problem-solving capability could break classical encryption systems, prompting governments and businesses to invest heavily in quantum-resistant security measures.