Observing the quantum nature of macroscopic scaled objects is one of the challenges in recent studies of mesoscopic physics. Such an experiment would be the test to our knowledge of quantum dissipative process that is crucial in understanding quantum to classical transition.
A system containing a sub-micron scaled mechanical oscillator with macroscopic number of atoms, seems to be an excellent candidate to pursue this goal.
I will present our theoretical study of a qubit dispersively coupled to a finite temperature, dissipative, driven oscillator; a system where quantum effects can be observed in the system. Using master equation expressed in gaussian wigner functions, we will discuss the possibility to uncover the phonon number statistics of the oscillator, present an elegant and intuitive expression for entanglement and finally show an unambiguous way to indirectly detect the present of entanglement in the system.
 A. A. Clerk and D. Wahyu Utami, Phys. Rev A 75, 042302 (2007)
 D. Wahyu Utami and A. A. Clerk, Phys. Rev A 78, 042323 (2008)