Stefan Walter, Jan Carl Budich, Björn Trauzettel
We demonstrate that entanglement of two macroscopic nanoelectromechanical resonators - coupled to each other via a common detector, a tunnel junction - can be generated by running a current through the device. This can be most efficiently achieved if the two oscillators are initially both prepared in their ground states. We propose two kinds of setups where the generation of entanglement can be realized by two different means. In the first setup, the oscillators are indirectly coupled via common fermionic reservoirs with long coherence times. While this setup gives valuable insight in the physics of this open quantum system, the second proposed setup, an Andreev entangler, represents a novel and feasible way of entangling two nanomechanical oscillators. In the Andreev entangler, a split Cooper-pair that coherently tunnels to each oscillator, mediates their coupling and thereby generates entanglement between them.
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http://arxiv.org/abs/1210.0665
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