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International Nano-Optoelectronics Workshop

Generation of highly squeezed light at 860 nm

Kengo Nagashima, Genta Masada, Hajime Arao, Yuishi Takeno, Hidehiro Yonezawa, Akira Furusawa

Published Aug 1, 2008• 0 citations
Publisher

Abstract

We obtained -9.55plusmn0.03 dB squeezed vacuum at 860 nm by using a subthreshold optical parametric oscillator (OPO) with a periodically poled KTiOPO4(PPKTP) crystal as a nonlinear optical medium.
DOI
10.1109/inow.2008.4634494

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Quadrature squeezed states of light are important resources for continuous-variable quantum inforamtion protocols. Squeezing level or purity of the states often dominate the performances of such protocols. In this article, I review our experiment which generates the quadrature squeezed state of light at 860nm with high squeezing level and purity. The generated state has been improved in its squeezing level and purity by using a periodically-poled KTiOPO4 (PPKTP) crystal as a nonlinear optical medium in a sub-threshold cw pumped optical parametric oscillator.

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We report on efficient generation of second harmonic laser and single-mode vacuum squeezed light of 795 nm with periodically poled KTiOPO4 (PPKTP) crystals. We achieved 111 mW of ultra-violet (UV) light at 397.5 nm from 191 mW of fundamental light with a PPKTP crystal in a doubling cavity, corresponding to a conversion efficiency of 58.1%. Using the UV light to pump an optical parametric oscillator with a PPKTP crystal, we realized -5.6 dB of a maximum squeezing. We analyzed the pump power dependence of the squeezing level and concluded that the UV light induced losses limit the improvement of the squeezing level. The generated squeezed light has huge potential application in quantum memory and ultra-precise measurement.
Quadrature squeezed states of light are important resources for continuous-variable quantum inforamtion protocols. Squeezing level or purity of the states often dominate the performances of such protocols. In this article, I review our experiment which generates the quadrature squeezed state of light at 860nm with high squeezing level and purity. The generated state has been improved in its squeezing level and purity by using a periodically-poled KTiOPO4 (PPKTP) crystal as a nonlinear optical medium in a sub-threshold cw pumped optical parametric oscillator.