Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
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DOI：
10.1088/2058-9565/ac6dfd
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发表时间：
2021-09
影响因子：
6.7
通讯作者：
Lydia A. Kanari-Naish;Jack Clarke;Sofia Qvarfort;M. Vanner
中科院分区：
文献类型：
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作者：
Lydia A. Kanari-Naish;Jack Clarke;Sofia Qvarfort;M. Vanner
腔量子光学力学作为量子科学和技术的一个新平台，其应用范围从量子信息处理到物理基础的测试。对于光学力学来说，至关重要的是非高斯运动状态的产生和验证，而一个关键的突出挑战是在两个机械振荡器的位移中观察到规范的双模薛定谔猫态。在这项工作中，我们介绍了一种脉冲的方法，利用辐射压力相互作用的非线性结合光子计数测量产生这种纠缠的非高斯机械状态，并且，重要的是，描述了一个协议，使用后续的脉冲相互作用，以验证产生的非高斯纠缠。我们的脉冲验证协议允许测量两个机械振荡器的正交矩，直至任何有限阶，为二分机械量子态的实验表征提供工具集，并允许评估广泛的不可分离性标准。关键的实验因素，如光损耗和开放系统的动力学，仔细分析，我们表明，该计划是可行的，只有轻微的改进，目前的实验操作外的解析边带制度。我们的方案提供了一个新的途径，量子实验纠缠机械振荡器，并提供了显着的潜力，进一步研究和开发，利用这种非高斯态的量子信息和传感应用，并研究量子到经典的过渡。
Cavity quantum optomechanics has emerged as a new platform for quantum science and technology with applications ranging from quantum-information processing to tests of the foundations of physics. Of crucial importance for optomechanics is the generation and verification of non-Gaussian states of motion and a key outstanding challenge is the observation of a canonical two-mode Schrödinger-cat state in the displacement of two mechanical oscillators. In this work, we introduce a pulsed approach that utilizes the nonlinearity of the radiation–pressure interaction combined with photon-counting measurements to generate this entangled non-Gaussian mechanical state, and, importantly, describe a protocol using subsequent pulsed interactions to verify the non-Gaussian entanglement generated. Our pulsed verification protocol allows quadrature moments of the two mechanical oscillators to be measured up to any finite order providing a toolset for experimental characterisation of bipartite mechanical quantum states and allowing a broad range of inseparability criteria to be evaluated. Key experimental factors, such as optical loss and open-system dynamics, are carefully analyzed and we show that the scheme is feasible with only minor improvements to current experiments that operate outside the resolved-sideband regime. Our scheme provides a new avenue for quantum experiments with entangled mechanical oscillators and offers significant potential for further research and development that utilizes such non-Gaussian states for quantum-information and sensing applications, and for studying the quantum-to-classical transition.