Answers are grounded in this paper and cite their sources.
Demonstrates single-photon path entanglement distribution, indicating progress towards practical quantum repeaters.
We report the experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture. The entanglement is established upon detection of a single photon, originating from one of two spontaneous parametric down-conversion photon pair sources, after erasing the photon's which-path information. In order to certify the entanglement, we use an entanglement witness which does not rely on postselection. We herald entanglement between two locations, separated by a total distance of 2 km of optical fiber, at a rate of 1.6 kHz. This work paves the way towards high-rate and practical quantum repeater architectures.
No takes yet. Share an insight, caveat, or question.
Caspar et al. (2020) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: