Title: Breeding the Cat Through Superposition of Two Schrodinger Kittens Based on Coupled Waveguides Show Chinese title

Title: 通过耦合波导上两个薛定谔猫的叠加进行猫的繁殖

Abstract: Optical Schrodinger's cat (SC) is highly anticipated because of the potential of realizing fault-tolerant quantum computing, but the practical merit is only shown when the amplitude is larger than 2. However, such high-amplitude cats have not been prepared due to the limitations rooted in the existing method. Here, we demonstrate a principle that a large SC-like state can be generated by the superposition of two kittens in which two nearby coherent states interfere and grow to an enlarged coherent-like state. Further, we propose a scheme to breed the cat beyond the limitation in the former works with a high probability by realizing the superposition of two SCs in coupled waveguides. The principle and scheme demonstrated here provide a new perspective on understanding quantum superposition in phase space and a better solution for the efficient generation of SCs on chips. Show Chinese abstract

Abstract: 光学薛定谔猫（SC）备受期待，因为其有望实现容错量子计算，但只有当振幅大于2时，实际优势才能显现。 然而，由于现有方法的局限性，尚未能制备出高振幅的猫态。 在这里，我们展示了一个原理，即通过两个小猫态的叠加可以生成一个大的类似猫态，在此过程中两个相邻的相干态发生干涉并增长为一个扩大的类似相干态。 此外，我们提出了一种方案，通过在耦合波导中实现两个SC的叠加，以高概率超越之前工作中存在的限制来培育猫态。 这里展示的原理和方案为理解相空间中的量子叠加提供了新的视角，并为芯片上高效生成SC提供了更好的解决方案。