Bitwise bloqs are self adjoint (#1220)

bitwise bloqs are self adjoint

qualtran/bloqs/arithmetic/bitwise.ipynb

@@ -38,6 +38,8 @@
     "## `Xor`\n",
     "Xor the value of one register into another via CNOTs.\n",
     "\n",
+    "Maps basis states $|x, y\\rangle$ to $|x, y \\oplus x\\rangle$.\n",
+    "\n",
     "When both registers are in computational basis and the destination is 0,\n",
     "effectively copies the value of the source into the destination.\n",
     "\n",

qualtran/bloqs/arithmetic/bitwise.py

@@ -68,6 +68,9 @@ def bitsize(self) -> SymbolicInt:
     def is_symbolic(self):
         return is_symbolic(self.k, self.dtype)
 
+    def adjoint(self) -> 'XorK':
+        return self
+
     @cached_property
     def _bits_k(self) -> Sequence[int]:
         return self.dtype.to_bits(self.k)
@@ -116,7 +119,9 @@ def _xork() -> XorK:
 
 @frozen
 class Xor(Bloq):
-    """Xor the value of one register into another via CNOTs.
+    r"""Xor the value of one register into another via CNOTs.
+
+    Maps basis states $|x, y\rangle$ to $|x, y \oplus x\rangle$.
 
     When both registers are in computational basis and the destination is 0,
     effectively copies the value of the source into the destination.
@@ -135,6 +140,9 @@ class Xor(Bloq):
     def signature(self) -> Signature:
         return Signature.build_from_dtypes(x=self.dtype, y=self.dtype)
 
+    def adjoint(self) -> 'Xor':
+        return self
+
     def build_composite_bloq(self, bb: BloqBuilder, x: Soquet, y: Soquet) -> dict[str, SoquetT]:
         if not isinstance(self.dtype.num_qubits, int):
             raise DecomposeTypeError("`dtype.num_qubits` must be a concrete value.")
@@ -202,6 +210,9 @@ class BitwiseNot(Bloq):
     def signature(self) -> 'Signature':
         return Signature.build_from_dtypes(x=self.dtype)
 
+    def adjoint(self) -> 'BitwiseNot':
+        return self
+
     def build_composite_bloq(self, bb: 'BloqBuilder', x: 'Soquet') -> dict[str, 'SoquetT']:
         x = bb.add(OnEach(self.dtype.num_qubits, XGate()), q=x)
         return {'x': x}