Distribution of continuous-variable entanglement by separable Gaussian states

Details Distribution of continuous-variable entanglement by separable Gaussian states Distribution of continuous-variable entanglement by separable Gaussian states

2008-04-24

arxiv.org/abs/0804.3957v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.77.050302

Entangling two systems at distant locations using a {\it separable} mediating ancilla is a counterintuitive phenomenon proposed for qubits by T. Cubitt {\it et al}. [Phys. Rev. Lett. {\bf 91}, 037902 (2003)]. We show that such entanglement distribution is possible with Gaussian states, using a certain three-mode fully separable mixed Gaussian state and linear optics elements readily available in experiments. Two modes of the state become entangled by sequentially mixing them on two beam splitters, while the third one remains separable in all stages of the protocol.

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