def filtered_backends(provider: AccountProvider, simulator: bool = False):
if simulator:
return provider.backends(operational=True,
filters=lambda b: b.configuration().n_qubits
>= 2 and b.configuration().simulator)
return provider.backends(operational=True,
filters=lambda b: b.configuration().n_qubits >= 2
and not b.configuration().simulator)
def load_backend(provider: AccountProvider,
simulator: bool = False,
backend_name: Optional[str] = None,
reservation: int = 30) -> Backend:
# List of Providers (Both Real and Simulated) - provider.backends()
# --- System Info
# https://quantum-computing.ibm.com/services?systems=yours
# --- Real Quantum Computers
# ibmq_santiago, ibmq_athens - 5 Qubits, 32 Quantum Volume
# ibmq_belem, ibmq_quito - 5 Qubits, 16 Quantum Volume
# ibmq_lima, ibmqx2 (ibmq_5_yorktown) - 5 Qubits, 8 Quantum Volume
# ibmq_16_melbourne - 15 Qubits, 8 Quantum Volume
# ibmq_armonk - 1 Qubit, 1 Quantum Volume
# --- Simulators
# simulator_stabilizer - 5000 Qubits
# simulator_mps - 100 Qubits
# simulator_extended_stabilizer - 63 Qubits
# simulator_statevector, ibmq_qasm_simulator - 32 Qubits
# --- Notes
# ibmqx2 - Alias for ibmq_5_yorktown
if backend_name is not None:
return provider.get_backend(name=backend_name)
# Use Quantum Computer Or Simulator
return least_busy(filtered_backends(provider=provider,
simulator=simulator),
reservation_lookahead=reservation)
def most_busy_backend(provider: AccountProvider) -> IBMQBackend:
"""Return the most busy backend for the provider given.
Return the most busy available backend for those that
have a `pending_jobs` in their `status`. Backends such as
local backends that do not have this are not considered.
Args:
provider: IBM Quantum Experience account provider.
Returns:
The most busy backend.
"""
backends = provider.backends(simulator=False, operational=True)
return max([b for b in backends if b.configuration().n_qubits >= 5],
key=lambda b: b.status().pending_jobs)