论文标题
光子添加/减去多模式高斯状态的破坏性和非经典性
Decoherence and nonclassicality of photon-added/subtracted multi-mode Gaussian states
论文作者
论文摘要
光子添加和减法使高斯州非高斯。我们通过分析所得状态的Wigner负性和正交相干量表（QC），对这些过程产生的非经典性的变化进行定量分析。 QCS是最近引入的非经典性量度[PRL 122，080402（2019），PRL 124，090402（2020）]，我们表明在光子添加/减法下可能会发生相对增加，该添加/减法可以大至200 \％。这意味着非古老性的脱气和伴随的增加是有代价的。实际上，QCS与国家的反矫正速率成正比，因此所产生的状态更容易容易出现环境的逆转。我们的结果是定量的，并依赖于添加/减去单模式和多模式高斯状态的特征性和WIGNER功能的明确和一般表达式，我们为此提供了简单明了的衍生。这些表达式进一步使我们能够证明具有正wigner函数的光子提取状态的量子非高西度性。
Photon addition and subtraction render Gaussian states non-Gaussian. We provide a quantitative analysis of the change in nonclassicality produced by these processes by analyzing the Wigner negativity and quadrature coherence scale (QCS) of the resulting states. The QCS is a recently introduced measure of nonclassicality [PRL 122, 080402 (2019), PRL 124, 090402 (2020)], that we show to undergo a relative increase under photon addition/subtraction that can be as large as 200\%. This implies that the degaussification and the concomitant increase of nonclassicality come at a cost. Indeed, the QCS is proportional to the decoherence rate of the state so that the resulting states are considerably more prone to environmental decoherence. Our results are quantitative and rely on explicit and general expressions for the characteristic and Wigner functions of photon added/subtracted single- and multi-mode Gaussian states for which we provide a simple and straightforward derivation. These expressions further allow us to certify the quantum non-Gaussianity of the photon-subtracted states with positive Wigner function.
