Squeezed-Light Generation in Optical Waveguides

J.F. Ryan, M. B. Ward, J. Brown

Santiago Rojas-Rojas, E. Barriga, C. Muñoz +2 more

We present a scheme for generating and manipulating three-mode squeezed states with genuine tripartite entanglement by injecting single-mode squeezed light into an array of coupled optical waveguides. We explore the possibility to selectively generate single-mode squeezing or multimode squeezing at the output of an elliptical waveguide array, determined solely by the input light polarization. We study the effect of losses in the waveguide array and show that quantum correlations and squeezing are preserved for realistic parameters. Our results show that arrays of optical waveguides are suitable platforms for generating multimode quantum light, which could lead to novel applications in quantum metrology.

M. Yoshimura, T. Sugaya, Takuya Hirano +4 more

In the present work, we report the generation of pulsed squeezed light at 1550 nm by parametric amplification in a low-optical-loss high-efficiency PPLN-WG of length 51 mm developed by NIMS/Waseda. We observed -1.7 dB of squeezing and +6.5 dB of anti-squeezing when the pump pulse energy was only 3nJ (peak power was 0.5 W). The results indicate that the waveguide is capable of generating more than 6 dB squeezing by improving optical losses by shortening the WG length, anti-reflecting coating on WG surfaces, and temporal shaping of the local oscillator, and more that 10 dB squeezing may be possible by using the state of-the-art high efficiency photodiodes.

E. Giacobino

M. D. Reid, Alistair S. Lane, Daniel F. Walls

Gregory S. Kanter, Prem Kumar, Rostislav V. Roussev +3 more

We report on traveling-wave quadrature squeezing generated in an integrated optical circuit fabricated with periodicallypoled lithium niobate waveguides. The device integrates a secondharmonic-generation stage, waveguide couplers, spatial mode filters, and a degenerate-optical-parametric-amplification stage. The integrationpromises to create a low power, compact, and simple source of wideband squeezed light. -1 dB of squeezing is directly measured using 20 ps pulses with peak powers near 6W.