由于互联网的快速增长，信息通信量每月增加15%，几年内将达到每秒几十太比特。为无延迟地处理如此高容量的信息量，需要超高速光开关。最近接近皮秒速度的光开关已在具有次带间跃迁的半导体量子阱中得到演示。然而，其中的光开关时间受到粒子数弛豫时间T1的绝对限制。这里介绍 Due to the rapid growth of the Internet, the volume of information traffic has increased by 15% per month and will reach tens of terabits per second in a few years. To handle such a high volume of information without delay, an ultra-high speed optical switch is required. Optical switches recently approaching picosecond velocities have been demonstrated in semiconductor quantum wells with inter-band transitions. However, the optical switching time therein is limited by the absolute limit of the number of particles relaxation time T1. Introduced here