Code:
Basic quantum operations and states:
https://github.com/paulobmsousa/QuCode_21DaysChallenge/blob/main/QuCode_Day06_DiracNotation_HilbertSpaces_Ex1.py
Using Qiskit:
https://github.com/paulobmsousa/QuCode_21DaysChallenge/blob/main/QuCode_Day06_DiracNotation_HilbertSpaces_Ex2.py