论文标题
不完美的同源可见性对多空间模式的两模式挤压测量的影响
Effect of imperfect homodyne visibility on multi-spatial-mode two-mode squeezing measurements
论文作者
论文摘要
我们研究了同性恋探测器可见性对两种模式挤压光的空间多模式源的测量的影响。诸如光学参数振荡器（OPO）之类的源通常在单个空间模式下产生挤压，因为非线性介质在模式选择性光腔内。对于这样的来源，在额外的真空噪声中，同性恋探测器夫妇中的不完美干扰可见性，可以通过引入等效损失项来解释。在自由空间中，多空间模式系统不完美的同源探测器可见性可以逐步以不相关的挤压模式，因此可能会导致测量挤压的更快退化。我们通过实验显示了测得的挤压水平对用于探测由85RB蒸气中的自由空间四波混合过程产生的同源探测器的可见性的依赖性，并且还证明了一个简单的理论模型与实验数据密切同意。
We study the effect of homodyne detector visibility on the measurement of quadrature squeezing for a spatially multi-mode source of two-mode squeezed light. Sources like optical parametric oscillators (OPO) typically produce squeezing in a single spatial mode because the nonlinear medium is within a mode-selective optical cavity. For such a source, imperfect interference visibility in the homodyne detector couples in additional vacuum noise, which can be accounted for by introducing an equivalent loss term. In a free-space multi-spatial-mode system imperfect homodyne detector visibility can couple in uncorrelated squeezed modes, and hence can cause faster degradation of the measured squeezing. We show experimentally the dependence of the measured squeezing level on the visibility of homodyne detectors used to probe two-mode squeezed states produced by a free space four-wave mixing process in 85Rb vapor, and also demonstrate that a simple theoretical model agrees closely with the experimental data.
