Saraga Daniel S, Loss Daniel
Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Phys Rev Lett. 2003 Apr 25;90(16):166803. doi: 10.1103/PhysRevLett.90.166803. Epub 2003 Apr 24.
We propose a simple setup of three coupled quantum dots in the Coulomb blockade regime as a source for spatially separated currents of spin-entangled electrons. The entanglement originates from the singlet ground state of a quantum dot with an even number of electrons. To preserve the entanglement of the electron pair during its extraction to the drain leads, the electrons are transported through secondary dots. This prevents one-electron transport by energy mismatch, while joint transport is resonantly enhanced by conservation of the total two-electron energy.
我们提出了一种处于库仑阻塞 regime 的三个耦合量子点的简单设置，作为自旋纠缠电子空间分离电流的源。这种纠缠源于具有偶数个电子的量子点的单重基态。为了在电子对提取到漏极引线的过程中保持其纠缠，电子通过次级量子点传输。这通过能量失配防止了单电子传输，而双电子总能量守恒则共振增强了联合传输。
