vault backup: 2026-07-30 15:49:29

.obsidian/workspace.json

@@ -216,6 +216,7 @@
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@@ -233,7 +234,6 @@
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SS2026/Quantum Computing/Bernstein-Vazirani/Bernstein-Vazirani Algorithm.md

@@ -31,3 +31,14 @@ It can be calculated as follows:
 
 ![[Pasted image 20260730153305.png]]
 
+And we can rewrite $U_f(\ket{x} \otimes \ket{-})$ as
+
+![[Pasted image 20260730154444.png]]
+
+The bottom wire has not changed.
+The top wire now has f(x) encoded in its quantum state.
+The phenomenon that the output of f is encoded as a -1 is called phase kickback.
+We need one final step before measuring.
+
+
+Now, we perform one final hadamard gate on the top wire.