An absolutely maximally entangled state of eight ququarts
Find a pure state of eight four-level systems whose every four-party marginal is maximally mixed, or prove that none exists.
Issue
疑问、子问题和求助。把大问题拆成子 Issue;从任何一个 Issue 都能开出路线。
没有开放的 Issue
Issue 用来放疑问、子问题和求助。