量子通信是量子物理与信息科学的交叉学科，在实现信息的无条件安全传送、量子信息的操控、传递等方面具有重要的应用。课题组主要开展量子通信方面的实验和理论研究，针对量子通信的新原理、新方法进行探索和研究，并由此发展量子通信的相关新技术，研制相关原理型器件，推进量子通信的发展和实用化。近期的研究方向：连续变量量子保密通信；腔量子光力；光场量子态工程和操控。

Impact of Four-Wave-Mixing Noise from Dense Wavelength-Division-Multiplexing Systems on Entangled-State Continuous-Variable Quantum key Distribution

Shanna Du, Yan Tian, and Yongmin Li.

  Integrating quantum key distribution (QKD) on the existing optical fiber network through dense wavelength-division multiplexing (DWDM) can greatly reduce the costs of quantum channels and improve the....

Phys. Rev. Appl. 14, 024013 (2020).

Microfiber Mechanical Resonator for Optomechanics

Qiang Zhang, Ruili Zhai, Shiwei Yang, Shuai Yang, and Yongmin Li.

  Optomechanics is a promising field with important applications in ultrasensitive sensing and quantum information processing. A variety of micromechanical resonators are proposed and demonstrated for....

ACS Photonics 7, 695 (2020).

Generation of Gaussian-modulated entangled states for continuous variable quantum communication

Ning Wang, Shanna Du, Wwenyuan Liu, Xuyang Wang, and Yongmin Li.

  We present and demonstrate a high-efficiency and compact scheme for generating Gaussian-modulated Einstein– Podolsky–Rosen (EPR) entangled optical fields by injecting a modulated signal field into....

Optics Letters 44, 3613 (2019).

High-Gain and Narrow-Bandwidth Optical Amplifier via Optomechanical Four-Wave Mixing

Zongyang Li, Zhenqiang Ren, Yongmin Li, Yong-chun Liu, and Kunchi Peng.

  We present an ultrahigh gain, narrow bandwidth, and low noise optical amplifier via the radiation pressure induced by the four-wave mixing (FWM) effect based on a cavity optomechanical system in the....

Phys. Rev. Applied, 11, 064048 (2019).

Long-Distance Continuous-Variable Quantum Key Distribution with Entangled States

Ning Wang, Shanna Du, Wenyuan Liu, Xuyang Wang, Yongmin Li, and Kunchi Peng.

  We experimentally demonstrate long-distance continuous-variable quantum key distribution over a 50- km standard optical fiber based on continuous-variable Einstein-Podolsky-Rosen entangled states....

Phys. Rev. Applied,10,064028 (2018).