Generation of macroscopically distinguishable quantum states and detection by the squeezed vacuum technique

Antonio Mecozzi, P. Tombesi

Paolo Tombesi, Antonio Mecozzi

Here it is shown that, for a wide class of nonlinear Hamiltonians, an essentially classical initial state will evolve into the coherent superposition of distinguishable quantum states. The detection of the interference fringes can be performed by beating the light leaving the nonlinear optical medium with light from a local oscillator. A model for the loss in the detection apparatus is introduced. The squeezed-vacuum technique is introduced finally as a means of enhancing the interference fringes displaying the distinguishable quantum state.

Xu-dong Shang, Li Yu, Xue-dong Feng +1 more

Chenguang Ye, Jing Zhang, 山西大学光电研究所量子光学与光量子器件国家重点实验室，太原 030006

We demonstrated experimentally the generation of squeezed vacuum by a periodically poled KTP crystal in a continuous-wave optical parametric oscillator，which was pumped with 532nm field. The squeezed vacuum of 3.41 dB at 1064 nm was detected by a homodyne detection system. Moreover，the Wigner quasi-probability distribution function of the squeezed vacuum was reconstructed using quantum tomography technique.

Z. Ficek, R. Tanaś

Jeffrey H. Shapiro, Prem Kumar, Mari W. Maeda +1 more