# 问题：

Let$|\psi\rangle=(|0\rangle+|1\rangle) / \sqrt{2}$. Write out $|\psi\rangle^{\otimes 2}$ and $|\psi\rangle^{\otimes 3}$ explicitly, both in terms of tensor products like $|0\rangle |1\rangle$, and using the Kronecker product

## 解答

$|\psi\rangle^{\otimes 2}=\frac{1}{2}(|00\rangle+|10\rangle+|01\rangle+|11\rangle)$；

#### 参考

[1]www.qtumist.com