  We propose two schemes to establish entanglement between two mesoscopic
quantum systems through a third mesoscopic quantum system. The first scheme
entangles two nano-mechanical oscillators in a non-Gaussian entangled state
through a Cooper pair box. Entanglement detection of the nano-mechanical
oscillators is equivalent to a teleportation experiment in a mesoscopic
setting. The second scheme can entangle two Cooper pair box qubits through a
nano-mechanical oscillator in a thermal state without using measurements in the
presence of arbitrarily strong decoherence.
