Yonezawa Hidehiro, Nagashima Koyo, Furusawa Akira
Department of Applied Physics, School of Engineering, The University of Tokyo, Tokyo, Japan.
Opt Express. 2010 Sep 13;18(19):20143-50. doi: 10.1364/OE.18.020143.
We generate squeezed state of light at 860 nm with a monolithic optical parametric oscillator. The optical parametric oscillator consists of a periodically poled KTiOPO(4) crystal, both ends of which are spherically polished and mirror-coated. We achieve both phase matching and cavity resonance by controlling only the temperature of the crystal. We observe up to -8.0±0.2 dB of squeezing with the bandwidth of 142 MHz. Our technique makes it possible to drive many monolithic cavities simultaneously by a single laser. Hence our monolithic optical parametric oscillator is quite suitable to continuous-variable quantum information experiments where we need a large number of highly squeezed light beams.
我们利用单片光学参量振荡器产生了波长为860 nm的光压缩态。该光学参量振荡器由一块周期性极化的磷酸钛氧钾（KTiOPO₄）晶体组成，其两端经过球面抛光并镀有镜面。我们仅通过控制晶体的温度就实现了相位匹配和腔共振。我们观测到高达-8.0±0.2 dB的压缩，带宽为142 MHz。我们的技术使得用单束激光同时驱动多个单片腔成为可能。因此，我们的单片光学参量振荡器非常适合连续变量量子信息实验，在这类实验中我们需要大量高度压缩的光束。
