Squeezed light fields are a very important type of light sources, which have wide applications in optical communication and weak signal detection. When the quantum fluctuations of a certain observable orthogonal component of light fields are squeezed below the corresponding standard quantum limit, so this type of light fields are called squeezed state light fields. Due to their quantum noises being lower than those of all classical optical fields, including lasers, and the fact that two-mode orthogonal squeezed state light fields can directly provide the necessary nonlocal quantum entanglement for quantum information processing, the generations and applications of squeezed state light fields are important research topics in contemporary scientific and technological fields, such as quantum optics, quantum measurement, and quantum communication. Of course, reducing the noise of one orthogonal component of a squeezed light field comes at the cost of increasing the noise of the other orthogonal component of the light field.