For the first time cumulative distribution function and histogram of crossover frequency a contemporary operational amplifier ADA4898-2 is experimentally studied. Using USB lock–in amplifier, which allows automatic sweep current response non-inverting with significant static amplification, we measure 200 samples amplifiers. This new method gives advantage in accuracy speed study every amplifier...

Quantum key distribution with continuous variables already uses advantageous high-speed single-mode homodyne detection low electronic noise at room temperature. Together continuous-variable information encoding to nonclassical states, the distance for secure transmission through lossy channels can approach 300 km in current optical fibers. Such protocols tolerate higher channel and also limited...