Currently, there are the following backends:
Quantum computer
IBMBackend(name::String)
Simulator
Qiskit Aer
StateVectorSimulator()
GPUStateVectorSimulator()
CliffordSimulator()
GPUTensorNetworkSimulator()
QuantumClifford
TableauSimulator()
PauliFrameSimulator()
GPUPauliFrameSimulator()