论文标题
由逻辑门与非高斯资源状态制备的schrödinger猫状态：有限挤压和效率与单调的效果
Schrödinger cat states prepared by logical gate with non-Gaussian resource state: effect of finite squeezing and efficiency versus monotones
论文作者
论文摘要
量子测量引起的栅极基于与理想的立方相态用作非高斯资源的纠缠，能够以两种高忠诚度的形式产生shrödingercat状态。 Masalaeva，I.V。索科洛夫，物理。 Lett。 A 424，127846（2022）]。在这项工作中，我们研究了资源状态有限初始挤压对栅极性能的影响。我们为门输出状态提供了精确的解决方案，并证明存在一定程度的挤压，可以在实验中获得，因此，随着进一步的挤压，输出猫状态的质量几乎不会影响。另一方面，预期的Ancilla测量结果的可能性随挤压而降低。由于条件方案的总体效率应解释成功的概率，因此我们认为，这种资源状态的非高斯状态的衡量标准是Wigner对数的负negativiy and non-Gaussisian的这种衡量标准，不适用于评估基于量子段和后续项目测量的非高斯门的效率。
Quantum measurement-induced gate based on entanglement with ideal cubic phase state used as a non-Gaussian resource is able to produce Shrödinger cat state in the form of two high fidelity ``copies'' of the target state on phase plane [N.I. Masalaeva, I.V. Sokolov, Phys. Lett. A 424, 127846 (2022)]. In this work we examine the effect of finite initial squeezing of the resource state on the gate performance. We present exact solution for the gate output state and demonstrate that there exists a degree of squeezing, available in experiment, such that the output cat state quality almost does not impove with the further increase of squeezing. On the other hand, the probability of the expected ancilla measurement outcome decreases with squeezing. Since an overall efficiency of the conditional scheme should account for the probability of success, we argue that such measures of non-Gaussianity of the resource state as Wigner logarithmic negativiy and non-Gaussianity may not be directly applicable to assess the efficiency of non-Gaussian gates based on quantum entanglement and subsequent projective measurement.
