Enhancing Spin-Phonon and Spin-Spin Interactions Using Linear Resources in a Hybrid Quantum System.
Enhancing Spin-Phonon and Spin-Spin Interactions Using Linear Resources in a Hybrid Quantum System.
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DOI：
10.1103/physrevlett.125.153602
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发表时间：
2020-03
影响因子：
8.6
通讯作者：
Peng-Bo Li;Yuan Zhou;Wei‐bo Gao;F. Nori
中科院分区：
文献类型：
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作者：
Peng-Bo Li;Yuan Zhou;Wei‐bo Gao;F. Nori
混合自旋-机械装置为量子科学和技术提供了一个通用的平台，但改善此类系统的自旋-声子以及自旋-自旋耦合仍然是一个关键的挑战。在这里，我们提出并分析了一种实验上可行且简单的方法，在混合自旋-机械装置中，仅使用线性资源，就可以指数地增强自旋-声子以及声子介导的自旋-自旋相互作用。通过用含时泵浦调制机械悬臂梁的弹性常数，我们可以获得一个可调谐的、非线性的(双声子)对机械模的驱动，从而放大机械零点涨落，直接增强自旋-声子耦合。这种方法允许自旋-力学系统从弱耦合区驱动到强耦合区，甚至是超强耦合区。在色散区，这种方法大大增强了远距离固态自旋之间的声子介导的自旋-自旋相互作用，通常比没有调制的大两个数量级。作为一个例子，我们证明了所提出的方案即使在大耗散的情况下也可以高保真地产生多个自旋的纠缠态。
Hybrid spin-mechanical setups offer a versatile platform for quantum science and technology, but improving the spin-phonon as well as the spin-spin couplings of such systems remains a crucial challenge. Here, we propose and analyze an experimentally feasible and simple method for exponentially enhancing the spin-phonon and the phonon-mediated spin-spin interactions in a hybrid spin-mechanical setup, using only linear resources. Through modulating the spring constant of the mechanical cantilever with a time-dependent pump, we can acquire a tunable and nonlinear (two-phonon) drive to the mechanical mode, thus amplifying the mechanical zero-point fluctuations and directly enhancing the spin-phonon coupling. This method allows the spin-mechanical system to be driven from the weak-coupling regime to the strong-coupling regime, and even the ultrastrong coupling regime. In the dispersive regime, this method gives rise to a large enhancement of the phonon-mediated spin-spin interactions between distant solid-state spins, typically two orders of magnitude larger than that without modulation. As an example, we show that the proposed scheme can apply to generating entangled states of multiple spins with high fidelities even in the presence of large dissipations.