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arXiv 2008.11389quant-ph
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用于长离子弦量子计算的可扩展并行镊子门

Scalable and Parallel Tweezer Gates for Quantum Computing with Long Ion Strings

Tobias Olsacher, Lukas Postler, Philipp Schindler, Thomas Monz, Peter Zoller, Lukas M. Sieberer

备注：
24 pages, 12 figures
发表信息：
PRX Quantum 1, 020316 (2020)
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摘要：

捕获离子量子计算机已经在大约10个量子比特的寄存器中展示了高性能的门操作。然而，由于介导量子比特-量子比特耦合的离子的运动模式的全局性质，使用长一维（1D）离子串来放大和并行化量子计算是一个突出的挑战。在这里，我们设计的方法来实现可扩展的和并行的纠缠门使用工程本地化的声子模式。我们建议通过使用可编程光镊调整单个离子的局部势来定制这种局部模式。量子比特的小子集的局域化模式形成了在这些子集上并行执行纠缠门的基础。我们展示了这种方法的固有的可扩展性，提出了长一维离子链，甚至无限链均匀间隔的离子的分析和数值结果。此外，我们表明，我们的方法与最佳相干控制技术相结合，可以实现最大密度的通用并行量子线路。

英文摘要：

Trapped-ion quantum computers have demonstrated high-performance gate operations in registers of about ten qubits. However, scaling up and parallelizing quantum computations with long one-dimensional (1D) ion strings is an outstanding challenge due to the global nature of the motional modes of the ions which mediate qubit-qubit couplings. Here, we devise methods to implement scalable and parallel entangling gates by using engineered localized phonon modes. We propose to tailor such localized modes by tuning the local potential of individual ions with programmable optical tweezers. Localized modes of small subsets of qubits form the basis to perform entangling gates on these subsets in parallel. We demonstrate the inherent scalability of this approach by presenting analytical and numerical results for long 1D ion chains and even for infinite chains of uniformly spaced ions. Furthermore, we show that combining our methods with optimal coherent control techniques allows to realize maximally dense universal parallelized quantum circuits.

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