1.8k citations · 3.3k across the 15 of their papers we have counts for
15 papers
Free-Space Twin-Field Quantum Key Distribution
Yu-Huai Li, Ting Zeng, Min-Yan Wang +22
Twin-field quantum key distribution (TF-QKD) elevates the secure key rate from a linear to a square-root dependence on channel loss while preserving measurement-device-independent…
113 km Free-Space Time-Frequency Dissemination at the 19th Decimal Instability
Qi Shen, Jian-Yu Guan, Ji-Gang Ren +28
Optical clock networks play important roles in various fields, such as precise navigation, redefinition of "second" unit, and gravitational tests. To establish a global-scale optic…
Towards satellite-based quantum-secure time transfer
Hui Dai, Qi Shen, Chao-Ze Wang +11
High-precision time synchronization for remote clocks plays an important role in fundamental science and real-life applications. However, the current time synchronization technique…
Time-Frequency Transfer through a 70 dB Free Space Channel: Towards Satellite-Ground Time Dissemination
Qi Shen, Jian-Yu Guan, Ting Zeng +15
Time and frequency transfer lies at the heart of the field of metrology. Compared to current microwave dissemination such as GPS, optical domain dissemination can provide more than…
Spaceborne low-noise single-photon detection for satellite-based quantum communications
Meng Yang, Feihu Xu, Ji-Gang Ren +9
Single-photon detectors (SPDs) play important roles in highly sensitive detection applications, such as fluorescence spectroscopy, remote sensing and ranging, deep space optical co…
Design and Implementation of High-throughput PCIe with DMA Architecture between FPGA and PowerPC
Kun Cheng, Weiyue Liu, Qi Shen +1
We designed and implemented a direct memory access (DMA) architecture of PCI-Express(PCIe) between Xilinx Field Program Gate Array(FPGA) and Freescale PowerPC. The DMA architecture…
A 3.8 ps RMS time synchronization implemented in a 20 nm FPGA
Hong-Bo Xie, Yang Li, Qi Shen +2
A 3.8ps root mean square (RMS) time synchronization implemented in a 20nm fabrication process ultrascale kintex Field Programmable Gate Array (FPGA) is presented. The multichannel…
An ultra-sensitive balanced detector with low noise for continuous-variable quantum key distribution
Qi-Ming Lu, Qi Shen, Yuan Cao +2
A well-balanced detector with high sensitivity and low noise is presented in this paper. The two-stage amplification structure is used to increase electronic gain while keeping an…
Satellite-relayed intercontinental quantum network
Sheng-Kai Liao, Wen-Qi Cai, Johannes Handsteiner +33
We perform decoy-state quantum key distribution between a low-Earth-orbit satellite and multiple ground stations located in Xinglong, Nanshan, and Graz, which establish satellite-t…
Bell Test Over Extremely High-Loss Channels: Towards Distributing Entangled Photon Pairs Between Earth and Moon
Yuan Cao, Yu-Huai Li, Wen-Jie Zou +8
Quantum entanglement was termed "spooky action at a distance" in the well-known paper by Einstein, Podolsky, and Rosen. Entanglement is expected to be distributed over longer and l…
Satellite-to-ground quantum key distribution
Sheng-Kai Liao, Wen-Qi Cai, Wei-Yue Liu +31
Quantum key distribution (QKD) uses individual light quanta in quantum superposition states to guarantee unconditional communication security between distant parties. In practice,…
A Compact PCI-based Measurement and Control System for Satellite-Ground Quantum Communication
Binxiang Qi, Shubin Liu, Qi Shen +6
Since the 1990s, there has been a dramatic interest in quantum communication. Free-space quantum communication is being developed to ultra-long distance quantum experiment, which r…
A Multi-chain Measurements Averaging TDC Implemented in a 40 nm FPGA
Qi Shen, Shubin Liu, Binxiang Qi +4
A high precision and high resolution time-to-digital converter (TDC) implemented in a 40 nm fabrication process Virtex-6 FPGA is presented in this paper. The multi-chain measuremen…
A Fast Improved Fat Tree Encoder for Wave Union TDC in an FPGA
Qi Shen, Lei Zhao, Shubin Liu +5
Up to the present, the wave union method can achieve the best timing performance in FPGA based TDC designs. However, it should be guaranteed in such a structure that the non-thermo…
Direct and full-scale experimental verifications towards ground-satellite quantum key distribution
Jian-Yu Wang, Bin Yang, Sheng-Kai Liao +21
Quantum key distribution (QKD), provides the only intrinsically unconditional secure method for communication based on principle of quantum mechanics. Compared with fiber-based dem…