From beffc3ab2c52b95df77ebc5b61306576d0c6a0a6 Mon Sep 17 00:00:00 2001
From: Daniel Tsvetkov <danieltcv@gmail.com>
Date: Tue, 17 Mar 2020 17:24:09 +0100
Subject: [PATCH] with krisis quantum monty game

---
 09_quantum_monthy.py | 67 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 09_quantum_monthy.py

diff --git a/09_quantum_monthy.py b/09_quantum_monthy.py
new file mode 100644
index 0000000..533a24f
--- /dev/null
+++ b/09_quantum_monthy.py
@@ -0,0 +1,67 @@
+import random
+
+import numpy as np
+from qiskit import (
+    QuantumCircuit,
+    execute,
+    Aer)
+from collections import defaultdict
+
+CASE_IDENTICAL = "identical"
+CASE_ORTHOGONAL = "orthogonal"
+
+
+def perform_exp(case):
+    # Use Aer's qasm_simulator
+    simulator = Aer.get_backend('qasm_simulator')
+    all_counts = defaultdict(int)
+
+    qc = QuantumCircuit(2, 2)
+
+    # produce angles with uniform distribution on the sphere
+    t = round(np.random.uniform(0, 1), 10)
+    theta0 = np.arccos(1 - 2 * t)
+    phi0 = round(np.random.uniform(0, 2 * np.pi), 10)
+
+    # rotate the 0th qubit in (theta, phi)
+    qc.r(theta0, phi0, 0)
+
+    # rotate the 1st qubit depending on the case we are exploring...
+    if case == CASE_IDENTICAL:
+        # ... for identical we are rotating the 1st qubit the same angles as
+        # the 0th
+        theta1, phi1 = theta0, phi0
+    elif case == CASE_ORTHOGONAL:
+        # for orthogonal we rotate the 1st qubit in 90 degrees
+        # orthogonal to the first
+        theta1, phi1 = theta0 + np.pi, phi0
+
+    # perform the rotation of the 1st qubit
+    qc.r(theta1, phi1, 1)
+
+    # Measure in the Bell's basis
+    qc.cx(0, 1)
+    qc.h(0)
+
+    # measuring maps the 0/1 qubit register to the 0/1 classical register
+    qc.measure([0, 1], [0, 1])
+
+    # execute the job
+    job = execute(qc, simulator, shots=1)
+    result = job.result()
+    counts = result.get_counts(qc)
+    return [i for i in counts.keys()][0]
+
+
+if __name__ == "__main__":
+    correct = 0
+    for i in range(100):
+        case = random.choice([CASE_IDENTICAL, CASE_ORTHOGONAL])
+        result = perform_exp(case=case)
+        if result == '11':
+            guess = CASE_ORTHOGONAL
+        else:
+            guess = CASE_IDENTICAL
+        if guess == case:
+            correct += 1
+    print("Correct: {}".format(correct))