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Multiple choice
In the orthonormal basis
{
∣
0
⟩
,
∣
1
⟩
}
\{|0\rangle, |1\rangle\}
{
∣0
⟩
,
∣1
⟩}
, add the four inner products
⟨
0
∣
0
⟩
+
⟨
0
∣
1
⟩
+
⟨
1
∣
0
⟩
+
⟨
1
∣
1
⟩
\langle 0|0\rangle + \langle 0|1\rangle + \langle 1|0\rangle + \langle 1|1\rangle
⟨
0∣0
⟩
+
⟨
0∣1
⟩
+
⟨
1∣0
⟩
+
⟨
1∣1
⟩
. What is the sum?
4
2
1
0
Check answer