code: def test_grover_iteration_2():
      numqubits = 4
      basis_states = superposition_basis(numqubits)
      v = OracleGate(numqubits, return_one_on_two)
      # After (pi/4)sqrt(pow(2, n)), IntQubit(2) should have highest prob
      # In this case, after around pi times (3 or 4)
      iterated = grover_iteration(basis_states, v)
      iterated = qapply(iterated)
      iterated = grover_iteration(iterated, v)
      iterated = qapply(iterated)
      iterated = grover_iteration(iterated, v)
      iterated = qapply(iterated)
      # In this case, probability was highest after 3 iterations
      # Probability of Qubit('0010') was 251/256 (3) vs 781/1024 (4)
      # Ask about measurement
      expected = (-13 * basis_states) / 64 + 264 * IntQubit(
          2, numqubits
      ) / 256
      assert qapply(expected) == iterated
  
file_path: sympy/sympy/physics/quantum/tests/test_grover.py
imports: from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.matrices.dense import Matrix
  from sympy.physics.quantum.represent import represent
  from sympy.physics.quantum.qapply import qapply
  from sympy.physics.quantum.qubit import IntQubit
  from sympy.physics.quantum.grover import apply_grover, superposition_basis, OracleGate, grover_iteration, WGate
label_desc: Use image node_id 7 for calling a global function with example usage: test_grover_iteration_2() without return types