论文标题
量子点的量子zeno操纵
Quantum Zeno Manipulation of Quantum Dots
论文作者
论文摘要
我们研究量子ZENO效应是否以及如何通过频繁测量来抑制量子演化的抑制作用，可用于将量子点与周围的电子储量分离。与经常研究的离散水平之间的隧穿的情况相反，我们认为将电子从连续储存器中的电子隧穿到DOT中的离散水平。在这种情况下，意识到量子zeno效应可能会更加困难，因为在储层中留下的孔的波数据包远离点附近，应重复测量。因此，可以通过与DOT或足够小的费米速度或强大的外部磁场的平面带（组速度缓慢）来降低所需的重复速率。我们还考虑了抗泽诺效应，即测量如何加速或启用量子进化。
We investigate whether and how the quantum Zeno effect, i.e., the inhibition of quantum evolution by frequent measurements, can be employed to isolate a quantum dot from its surrounding electron reservoir. In contrast to the often studied case of tunneling between discrete levels, we consider the tunnelling of an electron from a continuum reservoir to a discrete level in the dot. Realizing the quantum Zeno effect in this scenario can be much harder because the measurements should be repeated before the wave packet of the hole left behind in the reservoir moves away from the vicinity of the dot. Thus, the required repetition rate could be lowered by having a flat band (with a slow group velocity) in resonance with the dot or a sufficiently small Fermi velocity or a strong external magnetic field. We also consider the anti-Zeno effect, i.e., how measurements can accelerate or enable quantum evolution.
