Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

Yu Xu-Dong^{1, 3}, Li Wei^{1, 3}, Zhu Shi-Yao², Zhang Jing^{1, †,}

Schematic diagram of the MZ interferometer with two types of input quantum optical fields. The two input optical fields are interfere in the first BS with the different input relative phases θ. Then they are recombined and interfere on the second BS with the relative phase ϕ of the two arms of the interferometer.