  We analyze the steady-state entanglement between Bose-Einstein condensate
trapped inside an optical cavity with a moving end mirror (nanomechanical
resonator) driven by a single mode laser. The quantized laser field mediates
the interaction between the Bose-Einstein condensate and nanomechanical
resonator. In particular, we study the influence of temperature on the
entanglement of the coupled system, and note that the steady-state entanglement
is fragile with respect to temperature.
