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doichanj avatar doichanj commented on July 19, 2024 1

I think AerState is designed to simulate each operation interactively from Python.
And implementations of amplitude and probability is not well optimized and they get only one value per call and they convert binary -> string -> binary inside.
I think we can have some shortcut function to access statevector directly, but I have no idea if it is right way or not and it will be useful. @hhorii how do you think?

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hhorii avatar hhorii commented on July 19, 2024 1

As @doichanj mentioned, AerState is not a public API. But if you want to it to get amplitudes of statevector somehow, I recommend to use move_to_vector. With moved ndarray, a new AerState can be constructed with initialize() method.

qiskit-aer/qiskit_aer/quantum_info/states/aer_statevector.py

Lines 143 to 156 in 74e4397

aer_state = AerState()
options = AerSimulator._default_options()
for config_key, config_value in configs.items():
if options.get(config_key):
aer_state.configure(config_key, config_value)
if len(init_data) == 0:
raise AerError("initial data must be larger than 0")
num_qubits = int(np.log2(len(init_data)))
aer_state.allocate_qubits(num_qubits)
aer_state.initialize(data=init_data, copy=do_copy)

Again, AerState is an internal class and use it at your own risk.

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aromanro avatar aromanro commented on July 19, 2024

I'm already using move_to_vector as a workaround.

AerState is actually exposed in contrib/runtime (indeed, casted to a void*) and both aer_probability and aer_amplitude call the corresponding functions in AerState.

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