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We investigate the one-loop entanglement entropy of two short intervals withsmall cross ratio $x$ on a complex plane in two-dimensional conformal fieldtheory (CFT) using operator product expansion of twist operators. We focus onthe one-loop entanglement entropy instead of the general order $n$ R\'enyientropy, and this makes the calculation much easier. We consider thecontributions of stress tensor to order $x^{10}$, contributions of $W_3$operator to order $x^{12}$, and contributions of $W_4$ operator to order$x^{14}$. The CFT results agree with the ones in gravity.

On one-loop entanglement entropy of two short intervals from OPE of twist operators