4 papers
Improved linear and Kerr nonlinear phase estimation via photon addition operations
Zekun Zhao, Qingqian Kang, Shoukang Chang +4
The accuracy of quantum measurements can be effectively improved by using both photon-added non-Gaussian operations and Kerr nonlinear phase shifters. Here, we employ coherent stat…
Phase sensitivity via photon-subtraction operations inside Mach-Zehnder interferometer
Qisi Zhou, Qinqian Kang, Tao Jiang +4
Based on the conventional Mach-Zehnder interferometer, we propose a metrological scheme to improve phase sensitivity. In this scheme, we use a coherent state and a squeezed vacuum…
Improved phase sensitivity of an SU(1,1) interferometer based on the internal single-path local squeezing operation
Qingqian Kang, Zekun Zhao, Teng Zhao +2
Compared to passive interferometers, SU(1,1) interferometers exhibit superior phase sensitivity due to the incorporation of nonlinear elements that enhance their ability to detect…
Phase estimation via number-conserving operation inside the SU(1,1) interferometer
Qingqian Kang, Zekun Zhao, Teng Zhao +2
Utilizing nonlinear elements, SU(1,1) interferometers demonstrate superior phase sensitivity compared to passive interferometers. However, the precision is significantly impacted b…