Roles of thermal noise and detector efficiency in distillation of continuous variable entanglement state
ShengLi Zhang, Yuli Dong, Jianhong Shi, Xu‐Bo Zou, Guang‐Can Guo · Journal of the Optical Society of America B · 2013
We address the degradation of continuous variable (CV) entanglement distillation in the presence of thermal environment and nonunity detecting efficiency. We explore the logarithmic negativity as a criteria and compare the output entanglement between the schemes of single-photon subtraction (PS) and two-PS. The probability of success is also investigated. We show that compared with detector efficiency, thermal noise plays a more dominant role in Gaussian entanglement distillation. Our results shed more light on the noise mechanism that influences realistic CV entanglement distillation and is of experimental relevance in developing a more efficient entanglement distillation scheme.