Generation Of Bright Squeezed Light At 1.5?m Teleconmmunication Band And Its Wigner Function Reconstruction

Squeezed states light field as important resource of quantum information research,not only can be used in precision measurement beyond the shot-noise limit,quantum storage and manipulations between fields and atoms interactions,meanwhile a continuous variables quantum entanglement source can also be obtained through the beam splitter coupling and is used in the research of quantum teleportation,quantum dense coding and quantum cryptography.For practical quantum information research,continuous variables non-classical light fields have to be compatible with current optical fiber communication system to achieve long distance transmission.Thereby it is necessary that generating non-classical state light field at 1.5?m optical fiber communication band.Degenerate optical parametric amplifier with injection of the signal light generate bright squeezed states light field.The output field is not zero in favor of optical parametric amplifier cavity length locking so that stable output squeezed states light field for a long time,which provides an ideal light source for the fiber-based practical long-distance quantum information research.At the same time we reconstruct Wigner quasi-probability distribution function of squeezed states light field to reproduce all the information of evolution in phase space,which provides a powerful tool for the further study of squeezed states light field optical fiber transmission characteristics.The academic paper studies generation of continuous variables bright squeezed light at 1.5?m telecommunication band and its Wigner function reconstruction.The main contents are as follows:1.Using below the threshold type-I degenerate optical parametric amplifier generated continuous variables 1.5?m bright squeezed states light field.When the optical parametric amplifier operates at parametric amplifier state,the output down-converted field is bright quadrature phase squeezed states light field,measured the squeezed degree is 4.7 dB.When the optical parametric amplifier operates at parametric anti-amplifier state,the output down-converted field is bright quadrature amplitude squeezed states light field,measured the squeezed degree is 3 dB.2.Reconstruction Wigner quasi-probability distribution function of 1.5?m bright quadrature phase squeezed light by using time-domain balanced homodyne detection(BHD)techniques and quantum tomography technique.