As each quantum bit contains two probability amplitudes, each particle occupies two positions in space.Hence, the process of searching is accelerated. 因每個量子位有兩個概率幅，故每個粒子同時佔據空間兩個位置，在粒子數目相同時，能加速粒子的搜索進程。
Any alternative of quantum mechanics must be able to explain two-slit experiments, therefore it must contain passage conditions or probability amplitudes. 任何替代量子力學解釋量子現象的理論都得說明雙縫衍射實驗，這就必須引進通道條件或引進概率幅。
Whereas the absolute value of the probability amplitude encodes information about probabilities, its phase encodes information about the interference between quantum states. 但是概率振幅的絕對值編碼了概率信息，其相位編碼了量子態之間的干涉。
