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    • 1. 发明授权
    • Autocompensating quantum cryptographic key distribution system based on polarization splitting of light
    • 基于光分离的自动补偿量子密钥分配系统
    • US06188768B1
    • 2001-02-13
    • US09052860
    • 1998-03-31
    • Donald Stimson BethuneWilliam Paul Risk
    • Donald Stimson BethuneWilliam Paul Risk
    • H04L900
    • H04L9/0858
    • A quantum cryptographic key distribution (QKD) system splits discrete light signals from a laser source into a pair of light pulses that are orthogonally polarized with respect to each other, imparts a phase shift to one or both of these separate pulses during their round trip from the sender to the receiver and back, assures that the return pulses from the receiver are attenuated to single-photon pulses, recombines the phase-shifted pulses at the sender, and then detects from the recombined signal its polarization state, which is representative of the net phase shift imparted by the sender and receiver. The phase modulator at the receiver transmits only one polarization (e.g., vertical), but is used in a manner that permits it to equally modulate both polarization components of an arriving pulse. In this arrangement, when both components of a pulse reach the phase modulator at the receiver, they are both entirely vertically polarized and a phase shift is imparted at that time. This has the advantage that the effect of any time variation or phase errors in the phase modulator will be the same on both components. The key information is decoded at a detection stage at the sender that uses two detectors, one of which detects a first polarization state corresponding to the phase difference between the two phase shifts being 0 and the other of which detects a second polarization state corresponding to the phase difference between the two phase shifts being &pgr;.
    • 量子加密密钥分配(QKD)系统将来自激光源的离散光信号分离为相对于彼此正交极化的一对光脉冲,在这些单独脉冲的往返期间将相移置于这些分离脉冲中的一个或两个 发送器到接收器和背部,确保接收器的返回脉冲衰减到单光子脉冲,将发送器处的相移脉冲重新组合,然后从重新组合的信号中检测其偏振态,其代表 发送方和接收方给予的净相移。 接收器处的相位调制器仅传输一个偏振(例如,垂直),但以允许其均匀调制到达脉冲的两个偏振分量的方式使用。 在这种布置中,当脉冲的两个分量到达接收器处的相位调制器时,它们都是完全垂直极化的,并且在那时施加相移。 这具有以下优点:相位调制器中任何时间变化或相位误差的影响在两个部件上都是相同的。 密钥信息在使用两个检测器的发送器处的检测阶段被解码,其中一个检测到与两个相移之间的相位差相对应的第一偏振态,其中另一个检测到对应于 两相间的相位差为π。