Soliton back-action evading measurement using spectral filtering

We report on a back-action evading (BAE) measurement of the photon number of fiber optical solitons operating in the quantum regime. We employ a novel detection scheme based on spectral filtering of colliding optical solitons. The measurements of the BAE criteria demonstrate significant quantum state preparation and transfer of the input signal to the signal and probe outputs exiting the apparatus, displaying the quantum-nondemolition (QND) behavior of the experiment.Comment: 5 pages, 5 figure

Electrophysical properties of polymer composites penton-silver iodide system in 8-12 GHz frequency region

The heat field influence on electrophysical properties of polymer composites of the penton — dispersed silver iodide (Agl) system at volume filling from 0 to 100 % have been studied in 8-12 GHz frequency range. It has been shown that both real (ξ') and imaginary (ξ") complex dielectric permittivity components below the temperature of Agl dielectric-ionic phase transition (Tc = 420 K) depend on the content of the system components, and the imaginary component depends also on the polymer supermolecular structure. After Agl transition into ionic state, a percolation transition is observed in concentration dependences at critical percolation threshold about 30 vol.% filler content and extreme maxima about C = 50%. The ξ' and ξ" values exceed almost in wice the corresponding Agl characteristics. The results are discussed within the frame structure model