Add tket_squash_phasedx_rz() to C API (#2058)

Author: cqc-alec

TKET_VERSION

@@ -1 +1 @@
-2.1.57
+2.1.58

tket-c-api/include/tket-c-api.h

@@ -61,6 +61,16 @@ TketError tket_two_qubit_squash(
 TketError tket_clifford_simp(
     TketCircuit *circuit, TketTargetGate target_gate, bool allow_swaps);
 
+/**
+ * Squash sequences of single-qubit gates into PhasedX and Rz gates.
+ *
+ * Also remove identity gates. Commute Rz gates to the back if possible.
+ *
+ * @param circuit Circuit to transform (modified in-place)
+ * @return TKET_SUCCESS if successful, error code otherwise
+ */
+TketError tket_squash_phasedx_rz(TketCircuit *circuit);
+
 // Utility functions
 const char *tket_error_string(TketError error);
 

tket-c-api/src/tket-c-api.cpp

@@ -106,6 +106,14 @@ TketError tket_clifford_simp(
   return TKET_SUCCESS;
 }
 
+TketError tket_squash_phasedx_rz(TketCircuit *tc) {
+  if (!tc) return TKET_ERROR_NULL_POINTER;
+
+  Transforms::squash_1qb_to_Rz_PhasedX(true).apply(tc->circuit);
+
+  return TKET_SUCCESS;
+}
+
 const char *tket_error_string(TketError error) {
   switch (error) {
     case TKET_SUCCESS: