# Is RYY gate not available in IBM Quantum Composer?

If so, why? How to create the RYY-gate in the composer?

The $$R_{YY}$$ gate is not available within the Qiskit composer. This is because you can build it from other available gates within the composer. For instance, there is a nice way to represent $$R_{YY}$$ using the set $$\{ R_{XX}, R_X, R_Y, P \}$$. That is, suppose you want to implement $$R_{YY}(\theta)$$ then you can do it as:
Now, there is an option to add custom gate within the composer. Thus, you can embed this circuit in in as your $$R_{YY}$$ gate. That is one way to do it.
• Well, first note that $R_{XX}$ gate is not a native gate to the IBM hardware even though it is presented in the composer! What that means is that even the $R_{XX}$ gate must be decomposed down when run on the hardware in term of other gates (the native gates to the IBM hardware). So yes, implementing either $R_{XX}$ or $R_{YY}$ is costly. The $P$ gate is the phase gate $P(\theta) = \begin{pmatrix} 1 & 0 \\ 0 & e^{i\theta} \end{pmatrix}$ May 11 '21 at 3:50