Hao Chen

TL;DR: This record-breaking implementation of the MDIQKD method provides a new distance record and achieves a distance that the traditional Bennett-Brassard 1984 QKD would not be able to achieve with the same detection devices even with ideal single-photon sources.

TL;DR: In this paper, the authors demonstrate a secure key distribution that breaks the absolute key-rate limit of repeaterless QKD over a 509km-long ultralow loss optical fiber.

TL;DR: In this paper, a phase-matching QKD scheme was proposed to achieve a secret key rate of 0.118bps with a 502 km ultralow-loss optical fiber.

TL;DR: The key rate surpasses the linear key-rate bound via 302 km and 402 km commercial-fibre channels, achieving a key rate over 4 orders of magnitude higher than the existing results in literature.

TL;DR: In this paper, an investment casting method for duplex overall-cast directional-solidified turbine guide blades is presented, which comprises the steps of preparation of ceramic molding cores, placement of the molding core in shape molds for pressing of blade wax molds, coating of molding shells after mold assembly and dewaxing roasting, smelting and pouring, shell removal, core removal, and cutting of redundant gate parts.