Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Science. 2014 Jun 20;344(6190):1363-6. doi: 10.1126/science.1248459.
The quantum eraser is a device that illustrates the quantum principle of complementarity and shows how a dephased system can regain its lost quantum behavior by erasing the "which-path" information already obtained about it. Thus far, quantum erasers were constructed predominantly in optical systems. Here, we present a realization of a quantum eraser in a mesoscopic electronic device. The use of interacting electrons, instead of noninteracting photons, allows control over the extracted information and a smooth variation of the degree of quantum erasure. The demonstrated system can serve as a first step toward a variety of more complex setups.
量子擦除器是一种演示量子互补原理的设备，它展示了一个去相位系统如何通过擦除已经获得的关于它的“路径”信息来恢复其失去的量子行为。到目前为止，量子擦除器主要是在光学系统中构建的。在这里，我们在介观电子器件中实现了量子擦除器。与非相互作用的光子相比，使用相互作用的电子可以控制提取的信息，并可以平滑地改变量子擦除的程度。所展示的系统可以作为迈向各种更复杂的设置的第一步。
