Jian-Yu Guan

TL;DR: In this paper, the authors demonstrate free-space quantum key distribution over 53 km during the day by choosing a working wavelength of 1,550 nm and developing free space single-mode fiber-coupling technology and ultralow-noise upconversion single-photon detectors.

TL;DR: A 75 MHz clock rate fully automatic and highly stable system and superconducting nanowire single-photon detectors with detection efficiencies of more than 40%, which extends the secure transmission distance of MDIQKD to 200 km and achieves a secure key rate 3 orders of magnitude higher.

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: This work adopts the technology developed in the frequency and time transfer to lock two independent laser wavelengths and utilizes additional phase reference light to estimate and compensate the fiber fluctuation and calculates the secure key rates with the finite size effect.

TL;DR: In this article, the authors used state-of-the-art quantum optical technology to create, modulate and detect entangled photon pairs, achieving an efficiency of more than 78 per cent from creation to detection at a distance of about 200 metres that greatly exceeds the threshold for closing the "detection" loophole of the Bell test.