Improve Performance of eval() of OperatorStateFn @ VectorStateFn by > 1000 times (#6283)
Improve Performance of eval() of OperatorStateFn @ VectorStateFn by > 1000 times (#6283)

* improve performance

* remove conjugate of coeff
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py