Added Qiskit code to create and measure a Bell State

Author: chaitanyanitpawar

quantum/bell_state.py

@@ -0,0 +1,20 @@
+### Qiskit code to create and measure a Bell state. ####
+import numpy as np
+from qiskit import QuantumCircuit, execute, Aer
+# Create a Quantum Circuit with two qbits and 2 classical bits
+circuit = QuantumCircuit(2,2)
+# Add a H gate on qubit 0
+circuit.h(0)
+# Add a CX (CNOT) gate on control qubit 0 and target qubit 1
+circuit.cx(0,1)
+# Map the quantum measurement to the classical bits
+circuit.measure([0,1],[0,1])
+# Use Aer's qasm_simulator
+simulator = Aer.get_backend('qasm_simulator')
+# Execute the circuit on the qasm simulator
+job = execute(circuit, simulator, shots=1000)
+# Grab results from the job
+result = job.result()
+# Returns counts
+counts = result.get_counts(circuit)
+print("\nTotal count for 00 and 11 are:",counts)