Always return 1D vector from final_state_vector #5793
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Currently there is a special case for 0-qubit tensors, which causes the state vector to be returned as a scalar instead of a 1D vector of length 2**num_qubits == 1. Also change the `final_state_vector` property to use `_compat.cached_property`.
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Currently there is a special case for 0-qubit tensors, which causes the state vector to be returned as a scalar instead of a 1D vector of length 2**num_qubits == 1. Also change the `final_state_vector` property to use `_compat.cached_property`.
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Currently there is a special case for 0-qubit tensors, which causes the state vector to be returned as a scalar instead of a 1D vector of length 2**num_qubits == 1.
Also change the
final_state_vectorproperty to use_compat.cached_property.