Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings
Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings
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DOI：
10.1103/physrevb.93.035306
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发表时间：
2016-01-14
影响因子：
3.7
通讯作者：
Lyon, S. A.
中科院分区：
文献类型：
--
作者：
Pica, G.;Lovett, B. W.;Lyon, S. A.
硅中具有供体自旋的规模化量子计算机将受益于可行的半导体框架以及量子位与噪声环境的强大固有解耦。根据当前设计，通过自然交换相互作用耦合相邻自旋需要具有极小长度尺度的栅极控制结构。我们提出了一种硅架构，其中具有长相干时间的铋施主与可以在相邻量子点之间穿梭的电子耦合，从而放宽了间距要求并为经典控制设备的施主之间留出了空间。每个供体/点对内的绝热交换操作解决了基于交换的双量子位门固有的可扩展性问题，因为它不依赖于供体放置的亚纳米精度，并且对控制场中的噪声具有鲁棒性。我们使用这种交换与完善的全局微波拉比脉冲和并行电子穿梭一起构建需要最少且可行的本地控制的表面代码。
A scaled quantum computer with donor spins in silicon would benefit from a viable semiconductor framework and a strong inherent decoupling of the qubits from the noisy environment. Coupling neighboring spins via the natural exchange interaction according to current designs requires gate control structures with extremely small length scales. We present a silicon architecture where bismuth donors with long coherence times are coupled to electrons that can shuttle between adjacent quantum dots, thus relaxing the pitch requirements and allowing space between donors for classical control devices. An adiabatic SWAP operation within each donor/dot pair solves the scalability issues intrinsic to exchange-based two-qubit gates, as it does not rely on subnanometer precision in donor placement and is robust against noise in the control fields. We use this SWAP together with well established global microwave Rabi pulses and parallel electron shuttling to construct a surface code that needs minimal, feasible local control.