Du Wei, Jia Jun, Chen J F, Ou Z Y, Zhang Weiping
Opt Lett. 2018 Mar 1;43(5):1051-1054. doi: 10.1364/OL.43.001051.
Absolute sensitivity is measured for the phase measurement in an SU(1,1) type interferometer, and the results are compared to that of a Mach-Zehnder interferometer operated under the condition of the same intra-interferometer intensity. The interferometer is phase locked to a point with the largest quantum noise cancellation, and a simulated phase modulation is added in one arm of the SU(1,1) interferometer. Both the signal and noise level are estimated at the same frequency range, and we obtained 3 dB improvement in sensitivity for the SU(1,1) interferometer over the Mach-Zehnder interferometer. Our results demonstrate a direct phase estimation and may pave the way for practical applications of a nonlinear interferometer.
在一个SU(1,1)型干涉仪中测量了相位测量的绝对灵敏度，并将结果与在相同干涉仪内强度条件下运行的马赫-曾德尔干涉仪的结果进行了比较。该干涉仪被锁相到具有最大量子噪声消除的点，并在SU(1,1)干涉仪的一个臂中添加了模拟相位调制。在相同频率范围内估计了信号和噪声水平，并且我们获得了SU(1,1)干涉仪相对于马赫-曾德尔干涉仪在灵敏度上3 dB的提升。我们的结果展示了一种直接相位估计，并且可能为非线性干涉仪的实际应用铺平道路。
