1 files changed, 10 insertions, 2 deletions
diff --git a/libpsi-core/src/core/circuit.rs b/libpsi-core/src/core/circuit.rs
index 65e359a..43f51d0 100644
--- a/libpsi-core/src/core/circuit.rs
+++ b/libpsi-core/src/core/circuit.rs
@@ -2,8 +2,8 @@ use super::{ClassicalRegister, QuantumBit, QuantumGate};
 
 #[allow(dead_code)]
 struct QuantumCircuitInstruction {
-    target_indices: Vec<i32>,
-    control_indices: Vec<i32>,
+    target_indices: Vec<usize>,
+    control_indices: Vec<usize>,
     gate: QuantumGate,
 }
 
@@ -22,4 +22,12 @@ impl QuantumCircuit {
             instructions: Vec::new(),
         }
     }
+
+    pub fn apply(&mut self, gate: &QuantumGate, control_bits: &[usize], target_bits: &[usize]) {
+        self.instructions.push(QuantumCircuitInstruction {
+            gate: gate.clone(),
+            target_indices: target_bits.to_vec(),
+            control_indices: control_bits.to_vec(),
+        });
+    }
 }