Rikizo Ikuta

TL;DR: This work achieves the conversion of a picosecond visible photon at 780 nm to a 1,522-nm photon, and observed that the conversion process retained entanglement between the down-converted photon and another photon.

TL;DR: In this article, a single-photon frequency converter based on quasi-phase matched LiNbO3 was used for frequency domain Hong-Ou-Mandel interference between a heralded single photon at 780 nm and a weak laser pulse at 1,522 nm in a single spatial mode.

TL;DR: The transmission of single photons from a single ^{40}Ca^{+} ion coupled to an optical cavity over a 10 km optical fiber via frequency conversion from 866 nm to the telecom C band at 1530 nm is reported.

TL;DR: In this paper, a solid-state quantum frequency conversion to a telecom photon from a short-wavelength photon entangled with an atomic ensembles has been presented, and the photon has been translated to the telecom range while retaining the entanglement by a nonlinear-crystal-based frequency converter in a Sagnac interferometer.

TL;DR: A modified scheme for Bell state measurements which reduces the necessary resources for realising such an all-photonic repeater, and a proof-of-principle implementation of the implementation are shown.