arXiv subjects

Daruo Xie

Publications and source records attributed to Daruo Xie.

3 recordsLinked to original sources

arXiv2007

Enhanced optical communication and broadband sub-shot-noise interferometry with a stable free-running periodically-poled-KTiOPO4 squeezer

An intrinsically stable type-I optical parametric oscillator was built with a periodically poled KTiOPO4 (PPKTP) crystal to generate a stable bright, continuous-wave, broadband phase-squeezed beam. A 3.2 dB sensitivity enhancement of optical interferometry was demonstrated on weak electrooptic modulation signals within a 20 MHz squeezing bandwidth. This also realized a channel capacity increase beyond that of coherent optical communication.

quant-ph↗

arXiv2005

Low-frequency measurements of electro-optic coefficients of Na:KTP, and RTA

We report the measurement of the r23 and r33 electro-optic coefficients and of the z-axis electrical conductivity of the nonlinear optical crystals Na:KTP and RTA. We observed a marked decrease of the electro-optic effect in the Na:KTP crystals for frequencies below 100 Hz. This effect is absent in RTA.

physics.optics↗

arXiv2004

Multipartite continuous-variable entanglement from concurrent nonlinearities

We show theoretically that concurrent interactions in a second-order nonlinear medium placed inside an optical resonator can generate multipartite entanglement between the resonator modes. We show that there is a mathematical connexion between this system and van Loock and Braunstein's proposal for entangling N continuous quantum optical variables by interfering the outputs of N degenerate optical parametric amplifiers (OPA) at a N-port beam splitter. Our configuration, however, requires only one nondegenerate OPA and no interferometer. In a preliminary experimental study, we observe the concurrence of the appropriate interactions in periodically poled RbTiOAsO4.

quant-ph↗