Forced carrier perturbation opens a loophole for chip-based continuous variable quantum key distribution system.

The integration of the continous-variable quantum key distribution(CVQKD) system is an important technical route with great potential value for constructing high-performance and low-cost CVQKD system. In all previous CVQKD studies, the quantum efficiency of the detector can be calibrated in advance and is considered to remain unchanged. But when the size of the system shrinks to the on-chip level, especially in the premise of non-uniform waveguide, heavy doping and other factors, effects such as free carrier absorption and scattering loss will become prominent, which will directly cause carriers undergo violent migration due to the tiny jitter of the local oscillator and further lead to dynamical variation of quantum efficiency of detection.

[Three-dimensional finite element analysis of mandibular bilateral sagitta1 split ramus osteotomy with rigid internal fixation].

Purpose: To study the biomechanical characteristics of mandibular bilateral sagittal split ramus osteotomy(BSSRO) fixed with absorbable plate or titanium plate.

Methods: Spiral CT scan and finite element software (Ansys)were used to establish the three-dimensional finite element model of BSSRO with absorbable plate or titanium plate. The stress distribution of the internal fixation and the displacement of splited mandible was calculated under three kinds of occlusion position.