量子计算机解开“绳结”数学难题
Quantinuum公司研究人员利用量子计算机H2-2通过计算绳结的琼斯不变量，成功区分不同类型的绳结，速度可能超越经典计算机。未来设备有望处理更复杂绳结问题，突破经典超级计算机限制。该技术还可用于验证量子计算机性能，并探索其他拓扑学问题在量子计算中的应用潜力。
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量子计算机解开“绳结”数学难题 中国科技网/科学网
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Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
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