Maslova N S, Arseyev P I, Mantsevich V N
Quantum Technology Center and Quantum electronics department, Faculty of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia.
P.N. Lebedev Physical Institute RAS, 119991, Moscow, Russia.
Sci Rep. 2019 Feb 28;9(1):3130. doi: 10.1038/s41598-019-40038-2.
We have analyzed theoretically quenched dynamics of correlated double quantum dot (DQD) due to the switching "on" and "off" coupling to reservoirs. The possibility for controllable manipulation of charge and spin states in the double quantum dot was revealed and discussed. The proposed experimental scheme allows to prepare in DQD maximally entangled pure triplet state and to drive it to another entangled singlet state by tuning both applied bias and gate voltage. It was also demonstrated that the symmetry properties of the total system (double quantum dot coupled to electron reservoirs) allow to resolve the initially prepared two-electron states by detecting non-stationary spin-polarized currents flowing in both reservoirs and controlling the residual charge.
我们从理论上分析了由于与量子库的耦合“开启”和“关闭”而导致的相关双量子点（DQD）的猝灭动力学。揭示并讨论了在双量子点中可控操纵电荷和自旋态的可能性。所提出的实验方案允许在双量子点中制备最大纠缠纯三重态，并通过调节施加的偏置电压和栅极电压将其驱动到另一个纠缠单重态。还证明了整个系统（耦合到电子库的双量子点）的对称性允许通过检测在两个库中流动的非平稳自旋极化电流并控制剩余电荷来分辨最初制备的双电子态。
