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We perform ab initio QED calculations of energy levels for the $n=1$ and$n=2$ states of He-like ions with the nuclear charge in the range $Z = 12$-100.The complete set of two-electron QED corrections is evaluated to all orders inthe parameter $\aZ$. Uncalculated contributions to energy levels come throughorders $\alpha^3 (\aZ)^2$, $\alpha^2 (\aZ)^7$, and higher. The calculationpresented is the first treatment for excited states of He-like ions completethrough order $\alpha^2 (\aZ)^4$. A significant improvement in accuracy oftheoretical predictions is achieved, especially in the high-$Z$ region.Comment: 23 pages, 5 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

QED calculation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>energy levels in He-like ions

QED calculation of then=1andn=2energy levels in He-like ions