1 files changed, 121 insertions, 0 deletions
diff --git a/tester/custom_gates.rs b/tester/custom_gates.rs
new file mode 100644
index 0000000..ffe5c01
--- /dev/null
+++ b/tester/custom_gates.rs
@@ -0,0 +1,121 @@
+use crate::common::{benchmark_circuit, print_circuit, print_section, BenchmarkResult};
+use psi::{complex, matrix, CustomGate, CustomGateBuilder, QuantumCircuit};
+
+pub fn run_all(results: &mut Vec<BenchmarkResult>) {
+    println!("═══════════════════════════════════════════════════════════════");
+    println!("                    CUSTOM GATES TESTS");
+    println!("═══════════════════════════════════════════════════════════════\n");
+
+    test_bell_gate(results);
+    test_swap_gate(results);
+    test_sqrt_x_gate(results);
+}
+
+pub fn test_bell_gate(results: &mut Vec<BenchmarkResult>) {
+    print_section("Custom Gate: Bell Pair Creator");
+
+    let bell_gate = CustomGateBuilder::new("BELL", 2).h(0).cnot(0, 1).build();
+    let gate_clone = bell_gate.clone();
+
+    let builder = move || {
+        let mut circuit = QuantumCircuit::new(4);
+        circuit
+            .apply_custom(gate_clone.clone(), &[0, 1])
+            .apply_custom(gate_clone.clone(), &[2, 3]);
+        circuit
+    };
+
+    let display_circuit = {
+        let mut circuit = QuantumCircuit::new(4);
+        circuit
+            .apply_custom(bell_gate.clone(), &[0, 1])
+            .apply_custom(bell_gate.clone(), &[2, 3]);
+        circuit
+    };
+    print_circuit(&display_circuit);
+    results.push(benchmark_circuit("Custom BELL (4 qubits)", builder));
+
+    let mut display = {
+        let mut circuit = QuantumCircuit::new(4);
+        circuit
+            .apply_custom(bell_gate.clone(), &[0, 1])
+            .apply_custom(bell_gate.clone(), &[2, 3]);
+        circuit
+    };
+    display.compute();
+    println!("{}\n", display);
+}
+
+pub fn test_swap_gate(results: &mut Vec<BenchmarkResult>) {
+    print_section("Custom Gate: Swap via CNOTs");
+
+    let swap_gate = CustomGateBuilder::new("MYSWAP", 2)
+        .cnot(0, 1)
+        .cnot(1, 0)
+        .cnot(0, 1)
+        .build();
+    let gate_clone = swap_gate.clone();
+
+    let builder = move || {
+        let mut circuit = QuantumCircuit::new(2);
+        circuit.x(0).apply_custom(gate_clone.clone(), &[0, 1]);
+        circuit
+    };
+
+    let display_circuit = {
+        let mut circuit = QuantumCircuit::new(2);
+        circuit.x(0).apply_custom(swap_gate.clone(), &[0, 1]);
+        circuit
+    };
+    print_circuit(&display_circuit);
+    results.push(benchmark_circuit("Custom SWAP (2 qubits)", builder));
+
+    let mut display = {
+        let mut circuit = QuantumCircuit::new(2);
+        circuit.x(0).apply_custom(swap_gate.clone(), &[0, 1]);
+        circuit
+    };
+    display.compute();
+    println!("{}\n", display);
+}
+
+pub fn test_sqrt_x_gate(results: &mut Vec<BenchmarkResult>) {
+    print_section("Custom Gate: Matrix-defined √X gate");
+
+    let sqrt_x_matrix = matrix!(
+        [complex!(0.5, 0.5), complex!(0.5, -0.5)];
+        [complex!(0.5, -0.5), complex!(0.5, 0.5)]
+    );
+    let sqrt_x = CustomGate::from_matrix("√X", sqrt_x_matrix);
+    let gate_clone = sqrt_x.clone();
+
+    let builder = move || {
+        let mut circuit = QuantumCircuit::new(1);
+        circuit
+            .apply_custom(gate_clone.clone(), &[0])
+            .apply_custom(gate_clone.clone(), &[0]);
+        circuit
+    };
+
+    let display_circuit = {
+        let mut circuit = QuantumCircuit::new(1);
+        circuit
+            .apply_custom(sqrt_x.clone(), &[0])
+            .apply_custom(sqrt_x.clone(), &[0]);
+        circuit
+    };
+    print_circuit(&display_circuit);
+    results.push(benchmark_circuit("√X gate (1 qubit)", builder));
+
+    let mut display = {
+        let mut circuit = QuantumCircuit::new(1);
+        circuit
+            .apply_custom(sqrt_x.clone(), &[0])
+            .apply_custom(sqrt_x.clone(), &[0]);
+        circuit
+    };
+    display.compute();
+    println!("{}", display);
+    println!("(Two √X gates should equal X, so |0⟩ becomes |1⟩)\n");
+}
+