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Faithful Entanglement Swapping Based on Sum-Frequency Generation

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Published in Physical Review Letters. 2011, vol. 106, no. 12, p. 4
Abstract 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.
Stable URL https://archive-ouverte.unige.ch/unige:15855
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Deposited on : 2011-05-20

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