The key to a sound QKD system is how to generate highly effective quantum signal.
如何产生高效的量子信号，是量子密钥分配系统安全运行的关键。
The frequency of the sound wave is controlled by the feedback signal of the system.
声光晶体由行波场驱动，声场频率则由系统的反馈讯号控制。
There the electrical signal is changed back into sound.
在那儿电信号又变成声音。
There the electrical signal is changed back into sound.
在那儿电信号又变成声音。
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