Update app.py

app.py

@@ -1,36 +1,36 @@
-from qiskit import QuantumCircuit, transpile, assemble, Aer, execute
-from qiskit.visualization import plot_histogram
+from qiskit_aer import Aer
+from qiskit.utils import QuantumInstance
+from qiskit.algorithms import Shor
 import gradio as gr
 
-# This is just a placeholder for a basic quantum circuit that shows QFT
-def run_basic_qft_demo(N):
+# Function to run Shor's algorithm
+def run_shor(N):
     try:
         N = int(N)
-        if N <= 0 or N > 8:
-            return "Please enter a small integer (1–8) for demo."
+        if N % 2 == 0 or N <= 1:
+            return f"Please enter an odd integer > 1."
+        if N > 21:
+            return f"Too big! Factor small numbers like 15 or 21 for simulation."
 
-        qc = QuantumCircuit(N)
-        # Apply Hadamards to all qubits as a trivial QFT placeholder
-        for i in range(N):
-            qc.h(i)
+        backend = Aer.get_backend('aer_simulator')
+        quantum_instance = QuantumInstance(backend, shots=1024)
 
-        backend = Aer.get_backend("aer_simulator")
-        qc.measure_all()
-
-        result = execute(qc, backend, shots=1024).result()
-        counts = result.get_counts()
-
-        return f"Simulated simple QFT-like circuit for {N} qubits.\nResult: {counts}"
+        shor = Shor(quantum_instance=quantum_instance)
+        result = shor.factor(N)
 
+        if result.factors:
+            return f"Factors of {N} are: {result.factors}"
+        else:
+            return f"Failed to find factors. Try again!"
     except Exception as e:
         return str(e)
 
 iface = gr.Interface(
-    fn=run_basic_qft_demo,
-    inputs=gr.Number(label="Enter number of qubits (1–8)"),
+    fn=run_shor,
+    inputs=gr.Number(label="Enter an integer to factor"),
     outputs=gr.Textbox(label="Result"),
-    title="Modern Qiskit Demo — QFT placeholder",
-    description="Modern Qiskit 1.x example: runs a trivial circuit to show basic QFT structure. For real Shor, you’d build modular exponentiation + QFT manually."
+    title="Shor's Algorithm Demo",
+    description="A simple Qiskit + Gradio demo using the classic Shor's Algorithm. Runs on a simulator — use small N like 15, 21."
 )
 
 if __name__ == "__main__":