Infrared-dressed entanglement of cold open-shell polar molecules for universal matchgate quantum computing
Infrared-dressed entanglement of cold open-shell polar molecules for universal matchgate quantum computing
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DOI：
10.1088/1367-2630/16/7/075001
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发表时间：
2014-07-04
影响因子：
3.3
通讯作者：
Whaley, K. Birgitta
中科院分区：
文献类型：
--
作者：
Herrera, Felipe;Cao, Yudong;Whaley, K. Birgitta
使用光学晶格中的极性分子实现可扩展的量子信息处理器需要精确控制选定晶格位置中分子之间的长程偶极-偶极相互作用。我们在这里提出了一个方案，使用捕获的开壳层S2极性分子，允许最近和次最近的邻居之间的偶极交换过程进行控制，以构建一个广义的横向伊辛自旋哈密顿与可调XX，YY和XY耦合在旋转框架的驱动激光器。该方案需要一个中等强度的偏置磁场与近红外光一起提供量子比特能隙的局部调谐，以及中红外脉冲通过受激拉曼绝热通道进行旋转态转移。在没有红外驱动的情况下，量子比特之间不会发生相互作用。我们分析了由此产生的两个量子比特匹配门的保真度，并证明其作为驱动参数的函数的鲁棒性。我们讨论了该系统在光晶格中通用匹配门量子计算的实际应用。
Implementing a scalable quantum information processor using polar molecules in optical lattices requires precise control over the long-range dipole-dipole interaction between molecules in selected lattice sites. We present here a scheme using trapped open-shell S 2 polar molecules that allows dipolar exchange processes between nearest and next-nearest neighbors to be controlled in order to construct a generalized transverse Ising spin Hamiltonian with tunable XX, YY and XY couplings in the rotating frame of the driving lasers. The scheme requires a moderately strong bias magnetic field together with near-infrared light to provide local tuning of the qubit energy gap, and mid-infrared pulses to perform rotational state transfer via stimulated Raman adiabatic passage. No interaction between qubits occurs in the absence of the infrared driving. We analyze the fidelity of the resulting two-qubit matchgate, and demonstrate its robustness as a function of the driving parameters. We discuss a realistic application of the system for universal matchgate quantum computing in optical lattices.