Faithful entanglement swapping based on sum-frequency generation

Details Faithful entanglement swapping based on sum-frequency generation Faithful entanglement swapping based on sum-frequency generation

2011-01-05

arxiv.org/abs/1101.1009v2

Phys. Rev. Lett. 106, 120403 (2011)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

We show that the entanglement resulting from an entanglement swapping operation performed with spontaneous parametric down-conversion can be made faithful without post-selection using sum-frequency generation. This invites us to revisit the sum-frequency process and from a proof-of-principle experiment, we demonstrate that it provides a realistic solution for non-linear optics at the single-photon level. This opens the way to attractive alternatives to six-photon protocols based on linear optics used e.g. for the heralded creation of maximally entangled pairs or for the implementation of device-independent quantum key distribution.

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