We report demonstrations of both quadrature-squeezed vacuum and photon number difference squeezing generated in an integrated nanophotonic device. Squeezed light is generated via strongly driven spontaneous four-wave mixing below threshold in silicon nitride microring resonators. The generated light is characterized with both homodyne detection and direct measurements of photon statistics using photon number–resolving transition-edge sensors. We measure 1.0(1) decibels of broadband quadrature squeezing (~4 decibels inferred on-chip) and 1.5(3) decibels of photon number difference squeezing (~7 decibels inferred on-chip). Nearly single temporal mode operation is achieved, with measured raw unheralded second-order correlations g⁽²⁾ as high as 1.95(1). Multiphoton events of over 10 photons are directly detected with rates exceeding any previous quantum optical demonstration using integrated nanophotonics. These results will have an enabling impact on scaling continuous variable quantum technology.

我们报告了集成纳米光子器件中产生的正交压缩真空和光子数差压缩的演示。压缩光是通过在氮化硅微环谐振器中低于阈值的强驱动自发四波混合产生的。产生的光通过零差检测和使用光子数解析跃迁边缘传感器直接测量光子统计数据来表征。我们测量宽带正交压缩的1.0（1）分贝（片上推断约4分贝）和光子数差压缩的1.5（3）分贝（片上推断约7分贝）。借助测量的原始未经预言的二阶相关系数g ^（2），实现了几乎单一的时间模式操作高达1.95（1）。使用集成纳米光子技术，可以直接检测超过10个光子的多光子事件，其速率超过任何先前的量子光学演示。这些结果将对缩放连续可变量子技术产生有利影响。