Detection and perfect fitting of 132 dB squeezed vacuum states by considering green-light-induced infrared absorption

Abstract

We report on a high-level squeezed vacuum state with maximum quantum noise reduction of 13.2 dB directly detected at the pump power of 180 mW. The pump power dependence of the squeezing factor is experimentally exhibited. When considering only loss and phase fluctuation, the fitting results have a large deviation from the measurement value near the threshold. By integrating green-light-induced infrared absorption (GLIIRA) loss, the squeezing factor can be perfectly fitted in the whole pump power range. The result indicates that GLIIRA loss should be thoroughly considered and quantified in the generation of high-level squeezed states. Squeezed states, which have fewer fluctuations in one quadra-ture than vacuum noise at the expense of increased fluctuations in the other quadrature [1], can be used to enhance measurement precision [2-6], increase detection sensitivity [7-9], and improve fault tolerance performance for quantum information and quantum computation [10].