Robust and asynchronous entanglement manipulation of telecom photons

力三 生田

Sylvain Fasel, Olivier Alibart, Sébastien Tanzilli +4 more

We report on the experimental realization and characterization of an asynchronous heralded single-photon source based on spontaneous parametric down-conversion. Photons at 1550 nm are heralded as being inside a single-mode fibre with more than 60% probability, and the multi-photon emission probability is reduced by a factor of up to more than 500 compared to Poissonian light sources. These figures of merit, together with the choice of telecom wavelength for the heralded photons, are compatible with practical applications needing very efficient and robust single-photon sources.

Joseph M. Lukens, Amir Dezfooliyan, Jason S. Pelc +4 more

We demonstrate spectral shaping of entangled photons, implementing Hadamard coding and a Franson interferometer with a single pulse shaper. Our configuration represents a compact and robust arrangement for manipulating biphotons in the telecom band.

Zhen-Sheng Yuan, Xiao‐Hui Bao, Chao‐Yang Lu +3 more

Farid Samara, Nicolas Maring, Anthony Martin +4 more

Abstract Integrated photonics represents a technology that could greatly improve quantum communication networks in terms of cost, size, scaling, and robustness. A key benchmark for this is to demonstrate their performance in complex quantum networking protocols, such as entanglement swapping between truly independent photon-pair sources. Here, using two independent, asynchronously-pumped, integrated Si 3 N 4 microring resonator photon-pair sources, operating in the continuous-wave regime with time-resolved detections, we obtained state of the art Hong–Ou–Mandel (93.2 ± 1.6%) and entanglement swapping (91.2 ± 3.4%) visibilities, while maintaining high rates. The time-resolved detection facilitates high spectral purities without the need for spectral filtering. Our results demonstrate the potential of such telecom-band sources for practical, real-world quantum communication.

Harald Weinfurter