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arXiv 1507.08009cond-mat.mes-hall
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硅中施主束缚电子间的量子位间交换耦合

Engineering inter-qubit exchange coupling between donor bound electrons in silicon

Yu E. Wang, Archana Tankasala, Lloyd C. L. Hollenberg, Gerhard Klimeck, Michelle Y. Simmons, Rajib Rahman

摘要:

我们研究了硅中施主束缚电子之间的交换耦合(J)与失谐栅偏置的电控制,这对于在硅量子计算机中实现双量子比特门至关重要。我们发现非对称的2 P-1 P系统提供了一个高度可调的交换曲线与减轻J振荡,其中5个数量级的变化,可以实现使用一个适度的范围内的电场为15 nm的量子比特分离的交换能量。与凯恩量子位中的交换的势垒门控制相比,失谐门设计减少了精确供体分离、门宽度、密度和位置的苛刻约束,因为跨越几个数量级的J范围可以被设计用于各种供体分离。我们结合了一个大规模的全带原子紧束缚方法与全组态相互作用技术,以捕获门控施主的完整的双电子光谱,提供最先进的计算交换能在1 P-1 P和2 P-1 P量子比特。

英文摘要:

We investigate the electrical control of the exchange coupling (J) between donor bound electrons in silicon with a detuning gate bias, crucial for the implementation of the two-qubit gate in a silicon quantum computer. We find the asymmetric 2P-1P system provides a highly tunable exchange-curve with mitigated J-oscillation, in which 5 orders of magnitude change in the exchange energy can be achieved using a modest range of electric field for 15 nm qubit separation. Compared to the barrier gate control of exchange in the Kane qubit, the detuning gate design reduces the demanding constraints of precise donor separation, gate width, density and location, as a range of J spanning over a few orders of magnitude can be engineered for various donor separations. We have combined a large-scale full band atomistic tight-binding method with a full configuration interaction technique to capture the full two-electron spectrum of gated donors, providing state-of-the-art calculations of exchange energy in 1P-1P and 2P-1P qubits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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