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Get a half point of a point on elliptic curve.

Let $E$ be an elliptic cuve on finite field, $P\in E$ be a rational point. Then, I want to get one of point $Q\in E$ such that $2Q=P$ .

What shoud I do?

Get a half point of a point on elliptic curve.

Let $E$ be an elliptic cuve on finite field, $P\in E$ be a rational point. Then, I want to get one of point $Q\in E$ such that $2Q=P$ .

What shoud I do?

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