



'''simple docstring'''






import numpy as np
import qiskit
def 				lowerCamelCase__	(						_A = 8			,      _A = None    ):
  a						: Tuple					       =					np.random.default_rng(seed=_A    )

  # Roughly 25% of the qubits will contribute to the key.
  # So we take more than we need.
  a						: int					       =					6 * key_len
  # Measurement basis for Alice's qubits.
  a						: List[Any]					       =					rng.integers(2			,      size=_A    )
  # The set of states Alice will prepare.
  a						: Tuple					       =					rng.integers(2			,      size=_A    )
  # Measurement basis for Bob's qubits.
  a						: str					       =					rng.integers(2			,      size=_A    )

  # Quantum Circuit to simulate BB84
  a						: List[str]					       =					qiskit.QuantumCircuit(_A			,      name='BB84'    )

  # Alice prepares her qubits according to rules above.
  for index, _ in enumerate(_A    ):
    if alice_state[index] == 1:
      bbaa_circ.x(_A    )
    if alice_basis[index] == 1:
      bbaa_circ.h(_A    )
  bbaa_circ.barrier()

  # Bob measures the received qubits according to rules above.
  for index, _ in enumerate(_A    ):
    if bob_basis[index] == 1:
      bbaa_circ.h(_A    )

  bbaa_circ.barrier()
  bbaa_circ.measure_all()

  # Simulate the quantum circuit.
  a						: Optional[Any]					       =					qiskit.Aer.get_backend('aer_simulator'    )
  # We only need to run one shot because the key is unique.
  # Multiple shots will produce the same key.
  a						: List[Any]					       =					qiskit.execute(_A			,      _A			,      shots=1			,      seed_simulator=_A    )
  # Returns the result of measurement.
  a						: Any					       =					job.result().get_counts(_A    ).most_frequent()

  # Extracting the generated key from the simulation results.
  # Only keep measurement results where Alice and Bob chose the same basis.
  a						: Any					       =					''.join(
      [
          result_bit
          for alice_basis_bit, bob_basis_bit, result_bit in zip(
              _A			,      _A			,      _A    )
          if alice_basis_bit == bob_basis_bit
      ]    )

  # Get final key. Pad with 0 if too short, otherwise truncate.
  a						: Any					       =					gen_key[:key_len] if len(_A    ) >= key_len else gen_key.ljust(_A			,      '0'    )
  return key


if __name__ == "__main__":
     print(F"The generated key is : {bbaa(8, seed=0)}")
     from doctest import testmod

     testmod()




'''simple docstring'''






from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_tokenizers_available, is_torch_available


lowerCAmelCase: Optional[int]							=						{
    'configuration_graphormer': ['GRAPHORMER_PRETRAINED_CONFIG_ARCHIVE_MAP', 'GraphormerConfig'],
}

try:
     if not is_torch_available():
          raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
     pass
else:
     lowerCAmelCase: int							=						[
         'GRAPHORMER_PRETRAINED_MODEL_ARCHIVE_LIST',
         'GraphormerForGraphClassification',
         'GraphormerModel',
         'GraphormerPreTrainedModel',
     ]


if TYPE_CHECKING:
     from .configuration_graphormer import GRAPHORMER_PRETRAINED_CONFIG_ARCHIVE_MAP, GraphormerConfig

     try:
          if not is_torch_available():
               raise OptionalDependencyNotAvailable()
     except OptionalDependencyNotAvailable:
          pass
     else:
          from .modeling_graphormer import (
              GRAPHORMER_PRETRAINED_MODEL_ARCHIVE_LIST,
              GraphormerForGraphClassification,
              GraphormerModel,
              GraphormerPreTrainedModel,
          )


else:
     import sys

     lowerCAmelCase: str							=						_LazyModule(__name__, globals()['__file__'], _import_structure, module_spec=__spec__)