Lenses of this kind may be used , for example , as beam - splitting mirrors to divide a beam of light into two parts 這類鏡片可用作分光鏡,將一束光分成兩部份。
Practical implementations of quantum key distribution systems use attenuated laser pulses as the signal source rather than single photons . the channels used to transmit are lossy . on the basis of above two points , a combining eavesdropping strategy of intercept - resend and beam - splitting is discussed in terms of eavesdropper ' s technology requirement and detection efficiency and dark count of single - photon counter 主要工作包括以下三部分:一、基于實際量子密鑰分配( qkd )系統(tǒng)中所使用的強衰減的激光脈沖不是單光子,量子密鑰分配的信道不是無損耗的,光子計數(shù)器存在探測效率和暗計數(shù)以及竊聽者的技術(shù)能力也不是無限的這些具體問題。