摘要
Squeezed states belong to the most prominent non-classical resources.They have compelling applications in precise measurement, quantum computation, and detection.Here, we report on the direct measurement of 13.8 d B squeezed vacuum states by improving the interference efficiency and gain of balanced homodyne detection.By employing an auxiliary laser beam, the homodyne visibility is increased to 99.8%.The equivalent loss of the electronic noise is reduced to 0.05% by integrating a junction field-effect transistor(JFET) buffering input and another JFET bootstrap structure in the balanced homodyne detector.
Squeezed states belong to the most prominent non-classical resources. They have compelling applications in precise measurement, quantum computation, and detection. Here, we report on the direct measurement of 13.8 d B squeezed vacuum states by improving the interference efficiency and gain of balanced homodyne detection. By employing an auxiliary laser beam, the homodyne visibility is increased to 99.8%. The equivalent loss of the electronic noise is reduced to 0.05% by integrating a junction field-effect transistor(JFET) buffering input and another JFET bootstrap structure in the balanced homodyne detector.
作者
Xiaocong Sun
Yajun Wang
Long Tian
Yaohui Zheng
Kunchi Peng
孙小聪;王雅君;田龙;郑耀辉;彭堃墀(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)
基金
supported by the National Natural Science Foundation of China(NSFC)(Nos.11654002,61575114,11874250,and 11804207)
National Key Research and Development Program of China(No.2016YFA0301401)
Program for Sanjin Scholar of Shanxi Province
Program for Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
Fund for Shanxi “1331 Project”Key Subjects Construction
