Quantum Enhanced Measurement Using SU(1,1) Interferometer with Dual-beam Sensing
Yuhong Liu, Jiamin Li, Liang Cui, Nan Huo, Xiaoying Li, Z. Y. Ou · Frontiers in Optics / Laser Science · 2018
Using an SU(1,1) interferometer with dual-beam as the sensing field, we experimentally demonstrate the sensitivity of phase measurement is 2.4 dB higher than the standard quantum limit achieved by directly measuring a probe beam.