Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.120403
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Funding
- ERC-AG QORE
- Swiss NCCR Quantum Photonics
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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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