Current advances in nonlinear optics have made it possible to perform a homodyne-like tomography of an unknown state without highly efficient detectors or a strong local oscillator. Thereby, a new experimental direction has been opened into multimode and large-bandwidth quantum optics. An optical parametric amplifier (OPA) allows us to reconstruct the quadrature distribution of an unknown state directly from the measured intensity distribution with high precision. We propose adding a controllable displacement to the standard scheme, thus, obtaining a method applicable even to asymmetric and non-Gaussian states while significantly increasing estimation accuracy and lowering the OPA amplification requirement. To demonstrate the power of our method, we accurately detect the sub-Planck phase-space structure by obtaining distillable squeezing from the OPA estimates of various non-Gaussian states. With the improvements, OPA tomography became a generally applicable loss-tolerant and efficient alternative to homodyne detection.

中文翻译：

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非高斯光态的 OPA 层析成像


非线性光学的当前进步使得在没有高效探测器或强本振的情况下执行未知状态的类似零差的断层扫描成为可能。因此，多模和大带宽量子光学开辟了一个新的实验方向。光学参量放大器 （OPA） 使我们能够直接从测得的强度分布中高精度地重建未知状态的正交分布。我们建议在标准方案中增加一个可控位移，从而获得一种甚至适用于不对称和非高斯状态的方法，同时显著提高估计精度并降低 OPA 放大要求。为了证明我们方法的强大功能，我们通过从各种非高斯态的 OPA 估计中获得可蒸馏的压缩来准确检测亚普朗克相空间结构。随着这些改进，OPA 断层扫描成为一种普遍适用的、耐损且高效的零差检测替代方案。