**Micro-Macro Entanglement and Coarse-grained Measurements**

We are studying the demonstration of entanglement in a micro-macro system. The entanglement is
produced via parametric down conversion process between two photons and is being amplified through
a phase-co-variant cloner to entanglement between a photon and a beam of light. We introduce an
analogous system which exploits an entanglement breaking amplifier and produces only classical
correlation between the two parties. We show that it is hard to distinguish the outcomes of the two
systems, considering even a small inaccuracy in photon counting measurements. We model these
inaccuracies as coarse-graining. The result is that for certain types of measurements, small coarse-
graining makes the classical and quantum mechanical correlation indistinguishable.