The research team led by Academician Guo Guangcan and Professor Ren Xifeng from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) has successfully achieved Quantum photonic sources at cryogenic temperatures using the spontaneous four-wave mixing (SFWM) effect. The research findings have been published in Optica.

Quantum photonic integrated circuits (QPICs) have gained significant attention in the field of quantum information applications due to their high phase stability and reconfigurability. These circuits serve as powerful platforms and essential building blocks for various quantum systems. However, most existing research on QPICs focuses on their operation at ambient temperatures, whereas many quantum components necessitate cryogenic conditions. Therefore, it is crucial to design QPICs that can function effectively in cryogenic environments in order to facilitate scalable photonic quantum computing and interconnection between different quantum systems.

In light of this, the research team focused on studying the SFWM effect, known for its exceptional performance in nonlinear processes and quantum applications. By investigating the SFWM effect in an integrated silicon waveguide under cryogenic operation conditions, they made significant breakthroughs in generating quantum photonic sources.

Furthermore, the researchers studied the noises associated with the preparation of cryogenic photon-pair sources and experimentally demonstrated their generation with a bandwidth of approximately 2 THz.

To deepen their understanding, the researchers utilized a Michelson interferometer to investigate frequency-multiplexed energy-time entangled states.

The USTC researchers have made significant contributions to cryogenic nonlinear photonics by developing cryogenic Integrated Quantum Entangled light sources. These findings will greatly benefit the field of integrated scalable quantum information applications. The paper has received positive reviews from Optica, as it offers valuable insights into the study of integrated quantum optics in cryogenic environments.

 

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