Exciton entanglement in coupled quantum dots in a microcavity

We propose a scheme that allows generation of the Bell and $W$-type entangled states of excitons in quantum dots confined in a single-mode microcavity. It is shown that the entanglement of excitons can be generated when the photons leaking out of the cavity are detected by photon counter. The effect of environmental temperature on the entanglement of excitonic states is also studied.