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"两弹一星"科学家钱学森曾盛赞算盘,他说过:"算盘的发明,并不比中国的四大发明逊色,在某种程度上来说,算盘对世界的贡献要远大于四大发明。"为什么这位大科学家如此赞誉算盘呢?我们知道,新中国第一颗原子弹的计算任务,就是钱学森和许多科学家用自己的双手在算盘上完成的。 相似文献
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Quantum dialogue(QD) enables two communication parties to directly exchange secret messages simultaneously. In conventional QD protocols, photons need to transmit in the quantum channel for two rounds. In this paper, we propose a one-step QD protocol based on the hyperentanglement. With the help of the non-local hyperentanglement-assisted Bell state measurement(BSM), the photons only need to transmit in the quantum channel once. We prove that our one-step QD protocol is secure in theory and nume... 相似文献
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