Entanglement swapping between spacelike separated atoms

Details Entanglement swapping between spacelike separated atoms Entanglement swapping between spacelike separated atoms

2008-07-17

arxiv.org/abs/0807.2711v2

Phys. Rev. A 78, 052314 (2008)

Physics

Quantum Physics

v2: version accepted in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.78.052314

We show a mechanism that projects a pair of neutral two-level atoms from an initially uncorrelated state to a maximally entangled state while they remain spacelike separated. The atoms begin both excited in a common electromagnetic vacuum, and the radiation is collected with a partial Bell-state analyzer. If the interaction time is short enough and a certain two-photon Bell state is detected after the interaction, a high degree of entanglement, even maximal, can be generated while one atom is outside the light cone of the other, for arbitrary large interatomic distances.

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