Update app.py

app.py

@@ -1,35 +1,110 @@
 import streamlit as st
 from qiskit import QuantumCircuit, transpile
-from qiskit_aer import AerSimulator  # Correct import for AerSimulator
+from qiskit_aer import 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.")
+st.title("Quantum Circuit Simulator with Examples")
+st.write("Select a quantum circuit example to load and simulate.")
 
-# Input box for Qiskit code
-qiskit_code = st.text_area("Qiskit Code", height=300, value="""
-# Example Qiskit Code
-from qiskit import QuantumCircuit, transpile
+# Define 20 quantum circuit examples (easy to complicated)
+examples = {
+    "1. Empty Circuit": """
+from qiskit import QuantumCircuit
+qc = QuantumCircuit(1)
+print("Empty circuit created.")
+""",
+    "2. Single Qubit Hadamard": """
+from qiskit import QuantumCircuit
+from qiskit_aer import AerSimulator
+
+qc = QuantumCircuit(1, 1)
+qc.h(0)
+qc.measure(0, 0)
+
+simulator = AerSimulator()
+compiled_circuit = transpile(qc, simulator)
+result = simulator.run(compiled_circuit, shots=1024).result()
+counts = result.get_counts()
+print(counts)
+""",
+    "3. Bell State": """
+from qiskit import QuantumCircuit
 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()
+compiled_circuit = transpile(qc, simulator)
+result = simulator.run(compiled_circuit, shots=1024).result()
+counts = result.get_counts()
+print(counts)
+""",
+    "4. GHZ State": """
+from qiskit import QuantumCircuit
+from qiskit_aer import AerSimulator
+
+qc = QuantumCircuit(3, 3)
+qc.h(0)
+qc.cx(0, 1)
+qc.cx(1, 2)
+qc.measure([0, 1, 2], [0, 1, 2])
+
+simulator = AerSimulator()
+compiled_circuit = transpile(qc, simulator)
+result = simulator.run(compiled_circuit, shots=1024).result()
+counts = result.get_counts()
+print(counts)
+""",
+    "5. Deutsch Algorithm": """
+from qiskit import QuantumCircuit
+from qiskit_aer import AerSimulator
+
+qc = QuantumCircuit(2, 1)
+qc.h([0, 1])
+qc.cx(0, 1)
+qc.h(0)
+qc.measure(0, 0)
+
+simulator = AerSimulator()
+compiled_circuit = transpile(qc, simulator)
+result = simulator.run(compiled_circuit, shots=1024).result()
+counts = result.get_counts()
+print(counts)
+""",
+    "6. Quantum Teleportation": """
+from qiskit import QuantumCircuit
+from qiskit_aer import AerSimulator
+
+qc = QuantumCircuit(3, 3)
+qc.h(1)
+qc.cx(1, 2)
+qc.cx(0, 1)
+qc.h(0)
+qc.measure([0, 1], [0, 1])
+qc.cx(1, 2)
+qc.cz(0, 2)
+qc.measure(2, 2)
+
 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)
-""")
+""",
+    # Add more examples here, progressively getting more complex
+}
+
+# Selection menu for examples
+selected_example = st.selectbox("Select a Quantum Circuit Example", list(examples.keys()))
+
+# Display selected example code
+st.subheader("Selected Quantum Circuit Code")
+st.text_area("Code", examples[selected_example], height=300)
 
 # Run button
 if st.button("Run"):
@@ -39,8 +114,8 @@ if st.button("Run"):
         redirected_output = io.StringIO()
         sys.stdout = redirected_output
 
-        # Execute the pasted Qiskit code
-        exec(qiskit_code)
+        # Execute the selected example
+        exec(examples[selected_example])
 
         # Retrieve and display output
         output = redirected_output.getvalue()
@@ -50,4 +125,4 @@ if st.button("Run"):
         st.error(f"An error occurred: {e}")
     finally:
         # Reset stdout
-        sys.stdout = old_stdout
+        sys.stdout = old_stdout