Faithful entanglement swapping based on sum-frequency generation

Faithful entanglement swapping based on sum-frequency generation

We show that an entanglement swapping operation performed with spontaneous parametric down-conversion can be made faithful without postselection using sum-frequency generation. This invites us to revisit the sum-frequency process and from a proof-of-principle experiment, we demonstrate that it provi...

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Veröffentlicht in:Physical review letters 2011-03, Vol.106 (12), p.120403-120403, Article 120403
Hauptverfasser: Sangouard, Nicolas, Sanguinetti, Bruno, Curtz, Noé, Gisin, Nicolas, Thew, Rob, Zbinden, Hugo
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container_end_page 120403
container_issue 12
container_start_page 120403
container_title Physical review letters
container_volume 106
creator Sangouard, Nicolas
Sanguinetti, Bruno
Curtz, Noé
Gisin, Nicolas
Thew, Rob
Zbinden, Hugo
description We show that an entanglement swapping operation performed with spontaneous parametric down-conversion can be made faithful without postselection 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 nonlinear 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 device-independent quantum key distribution.
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title Faithful entanglement swapping based on sum-frequency generation
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