Single to quadruple quantum dots with tunable tunnel couplings
Single to quadruple quantum dots with tunable tunnel couplings
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DOI：
10.1063/1.4869108
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发表时间：
2014-03-17
影响因子：
4
通讯作者：
Tarucha, S.
中科院分区：
文献类型：
--
作者：
Takakura, T.;Noiri, A.;Tarucha, S.
我们制备了一个门控四重量子点，研究了在有限的量子点间隧道耦合下单量子点到四量子点的门控可调谐性。各种双点的测量充电能量表明，点的大小是由门的几何形状。对于三重点和四重点，我们研究了栅极可调谐的点间隧道耦合。对于三重点，我们发现边点之间的有效隧道耦合显著依赖于中心点电位的排列。这些结果意味着，目前的四重点有一个门的性能相关的实现基于自旋的四量子比特与可控的交换耦合。(C)2014 AIP Publishing LLC.
We prepare a gate-defined quadruple quantum dot to study the gate-tunability of single to quadruple quantum dots with finite inter-dot tunnel couplings. The measured charging energies of various double dots suggest that the dot size is governed by the gate geometry. For the triple and quadruple dots, we study the gate-tunable inter-dot tunnel couplings. For the triple dot, we find that the effective tunnel coupling between side dots significantly depends on the alignment of the center dot potential. These results imply that the present quadruple dot has a gate performance relevant for implementing spin-based four-qubits with controllable exchange couplings. (C) 2014 AIP Publishing LLC.