在纠缠中窥见自然的奥秘

身无彩凤双飞翼,心有灵犀一点通

——李商隐《无题》

唐代诗人李商隐的这首诗,道尽了人世间痴情男女虽天各一方、但彼此心意相通、似有一条丝线相连的缠绵。

其实,电子的世界亦如此。配对的电子,一旦形成一个纠缠态,无论相距多远,它们都能感受到彼此的心意” (自旋)。它们一个向上,一个向下,仿佛约好了似的。只要有一方改变状态,那么另一方就会立刻感受到,并且调整成与对方相反的状态。Continue reading

Unitary CFT description of DQCP is denied from quantum entanglememt entropy

The research team developed a new and more efficient quantum algorithm of the Monte Carlo techniques adopted by scientists to measure the Renyi entanglement entropy of objects. With this new tool, they measured the Rényi entanglement entropy at the DQCP and found the scaling behaviour of the entropy, i.e. how the entropy changes with the system sizes, is in sharp contrast with the description of conventional LGW types of phase transitions. Continue reading