Update app.py

app.py

@@ -1 +1,53 @@
-#test page
+import streamlit as st
+from qiskit import QuantumCircuit, transpile
+from qiskit_aer import AerSimulator  # Correct import for AerSimulator
+import io
+import sys
+
+# Title for the Streamlit app
+st.title("Quantum Circuit Emulator")
+st.write("Paste your Qiskit code below and press 'Run' to execute.")
+
+# Input box for Qiskit code
+qiskit_code = st.text_area("Qiskit Code", height=300, value="""
+# Example Qiskit Code
+from qiskit import QuantumCircuit, transpile
+from qiskit_aer import AerSimulator
+# Create a Quantum Circuit
+qc = QuantumCircuit(2, 2)
+# Apply Hadamard and CNOT gates
+qc.h(0)
+qc.cx(0, 1)
+# Measure the qubits
+qc.measure([0, 1], [0, 1])
+# Use AerSimulator as the backend
+simulator = AerSimulator()
+# Transpile the circuit for the simulator
+compiled_circuit = transpile(qc, simulator)
+# Execute the circuit
+result = simulator.run(compiled_circuit, shots=1024).result()
+# Get the measurement results
+counts = result.get_counts()
+print(counts)
+""")
+
+# Run button
+if st.button("Run"):
+    try:
+        # Redirect stdout to capture print output
+        old_stdout = sys.stdout
+        redirected_output = io.StringIO()
+        sys.stdout = redirected_output
+
+        # Execute the pasted Qiskit code
+        exec(qiskit_code)
+
+        # Retrieve and display output
+        output = redirected_output.getvalue()
+        st.success("Execution successful!")
+        st.text_area("Output", output, height=200)
+    except Exception as e:
+        st.error(f"An error occurred: {e}")
+    finally:
+        # Reset stdout
+        sys.stdout = old_stdout