Anders and Briegel in Python
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  1. import numpy as np
  2. from abp import GraphState
  3. from abp import qi, clifford
  4. import random
  5. import itertools as it
  6. def test_single_qubit_measurements():
  7. """ Various simple tests of measurements """
  8. # Test that measuring |0> in Z gives 0
  9. g = GraphState([0], vop="hadamard")
  10. assert g.measure(0, "pz") == 0, "Measuring |0> in Z gives 0"
  11. # Test that measuring |1> in Z gives 1
  12. g = GraphState([0], vop="hadamard")
  13. g.act_local_rotation(0, "px")
  14. assert g.measure(0, "pz") == 1, "Measuring |1> in Z gives 1"
  15. # Test that measuring |+> in X gives 0
  16. g = GraphState([0], vop="hadamard")
  17. g.act_local_rotation(0, "hadamard")
  18. assert g.measure(0, "px") == 0
  19. assert g.measure(0, "px") == 0, "Measuring |+> in X gives 0"
  20. g.act_local_rotation(0, "pz")
  21. assert g.measure(0, "px") == 1, "Measuring |-> in X gives 1"
  22. def test_type():
  23. """ Test that the output is always an int """
  24. for r, m, f in it.product(list(range(24)), ("px", "py", "pz"), (0, 1)):
  25. g = GraphState([0], vop="hadamard")
  26. g.act_local_rotation(0, r)
  27. assert str(g.measure(0, m)) in "01"
  28. assert str(g.measure(0, m, f)) in "01"
  29. assert g.measure(0, m, f, detail=True)["determinate"] == True
  30. def test_random_outcomes():
  31. """ Testing random behaviour """
  32. ones = 0
  33. for i in range(1000):
  34. g = GraphState([0], vop="hadamard")
  35. g.act_local_rotation(0, "hadamard")
  36. ones += g.measure(0, "pz")
  37. assert 400 < ones < 600, "This is a probabilistic test!"
  38. def test_projection():
  39. """ Test that projection works correctly """
  40. g = GraphState([0], vop="hadamard")
  41. g.act_local_rotation(0, "hadamard")
  42. g.measure(0, "pz", 0)
  43. assert np.allclose(g.to_state_vector().state, qi.zero)
  44. # Now project onto |1>
  45. g = GraphState([0], vop="hadamard")
  46. g.act_local_rotation(0, "hadamard")
  47. g.measure(0, "pz", 1)
  48. assert np.allclose(g.to_state_vector().state, qi.one)
  49. def test_measure_sequence():
  50. """ Simple test of measurement sequences """
  51. g = GraphState(2, vop="identity")
  52. g.act_cz(0, 1)
  53. assert g.measure_sequence(((0, "px"), (1, "px")), forces=(0, 1)) == [0, 1]
  54. assert len(g.edgelist()) == 0
  55. assert g.node[1]["vop"] == clifford.pz