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One potential combo is $RY(\theta)$ on qubit 1, $CX$ from qubit 1 to qubit 2, then $RX(\pi)$ on qubit 2. This would be the following transformation:  |0\rangle |0\rangle \mapsto (\cos \frac{\theta}{2} |0\rangle + \sin \frac{\theta}{2}|1\rangle)|0\rangle \mapsto \cos \frac{\theta}{2} |00 \rangle + \sin \frac{\theta}{2} |11\rangle \mapsto \cos \frac{\theta}{...