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I was wondering how to create generalized entangled superpositions of qubits when I came to need of an algorithm to generate the following:

Suppose we have two $n$ qubit states, $$|\psi\rangle = \sum_X \alpha_X\ |X\rangle$$ and, $$|\phi\rangle = \sum_X \beta_X\ |X\rangle.$$

How do I come up with a state, $$|\psi'\rangle = \frac1{\sqrt N}\sum_X (\alpha_X+\beta_X)\ |X\rangle,$$ where $N$ is the normalization factor?

3https://arxiv.org/abs/1608.04349 Section II – Hemant – 2019-06-08T19:43:30.497

@Hemant thanks a lot! I'll check it out. – Kishore S Shenoy – 2019-06-09T04:49:23.873

See this question https://quantumcomputing.stackexchange.com/questions/5929/how-to-superpose-two-composite-qubit-states

– Danylo Y – 2019-06-09T08:38:53.237