Li Baijun, Qin Wei, Jiao Ya-Feng, Zhai Cui-Lu, Xu Xun-Wei, Kuang Le-Man, Jing Hui
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China.
Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan.
Fundam Res. 2022 Jul 13;3(1):15-20. doi: 10.1016/j.fmre.2022.07.001. eCollection 2023 Jan.
Schrödinger cat states, consisting of superpositions of macroscopically distinct states, provide key resources for a large number of emerging quantum technologies in quantum information processing. Here we propose how to generate and manipulate mechanical and optical Schrödinger cat states with distinguishable superposition components by exploiting the unique properties of cavity optomechanical systems based on Bose-Einstein condensate. Specifically, we show that in comparison with its solid-state counterparts, almost a 3 order of magnitude enhancement in the size of the mechanical Schrödinger cat state could be achieved, characterizing a much smaller overlap between its two superposed coherent-state components. By exploiting this generated cat state, we further show how to engineer the quadrature squeezing of the mechanical mode. Besides, we also provide an efficient method to create multicomponent optical Schrödinger cat states in our proposed scheme. Our work opens up a new way to achieve nonclassical states of massive objects, facilitating the development of fault-tolerant quantum processors and sensors.
薛定谔猫态由宏观上不同状态的叠加组成，为量子信息处理中大量新兴量子技术提供了关键资源。在此，我们提出如何通过利用基于玻色 - 爱因斯坦凝聚体的腔光机械系统的独特性质，来生成和操纵具有可区分叠加分量的机械和光学薛定谔猫态。具体而言，我们表明，与其固态对应物相比，机械薛定谔猫态的尺寸可实现近3个数量级的增强，这意味着其两个叠加相干态分量之间的重叠要小得多。通过利用这种生成的猫态，我们进一步展示了如何设计机械模式的正交压缩。此外，我们还在所提出的方案中提供了一种创建多分量光学薛定谔猫态的有效方法。我们的工作为实现大质量物体的非经典态开辟了一条新途径，有助于容错量子处理器和传感器的发展。
