量子旋转多样性在位移压缩二进制相移键控中的应用
Quantum Rotation Diversity in Displaced Squeezed Binary Phase-Shift Keying
AI总结：
本文提出一种利用量子旋转多样性提升光学量子通信在湍流信道中性能的方案，通过优化旋转角和能量分配实现四阶有效多样性。
摘要：
我们提出了一种用于光学量子通信的量子旋转多样性（QRD）方案，利用二进制相移键控位移压缩态和同频检波器，在Gamma-Gamma湍流信道中进行传输。通过被动的正交旋转将连续的时间模式耦合，将位移振幅在各个槽位之间重新分配，从而在独立衰落和联合最大似然检测下实现二阶多样性。推导了符号错误率性能的解析表达式，并给出了渐进行为下的多样性及编码增益结果。获得了最优旋转角和位移与压缩之间的能量分配的闭式解。此外，我们还表明，当位移幅度和压缩强度随总光子数成比例变化时，可以实现四阶的有效多样性。数值结果验证了分析，并展示了所提QRD方案的超多样性行为。
英文摘要：
We propose a quantum rotation diversity (QRD) scheme for optical quantum communication using binary phase-shift-keying displaced squeezed states and homodyne detection over Gamma-Gamma turbulence channels. Consecutive temporal modes are coupled by a passive orthogonal rotation that redistributes the displacement amplitude between slots, yielding a diversity order of two under independent fading and joint maximum-likelihood detection. Analytical expressions for the symbol-error rate performance, along with asymptotic results for the diversity and coding gains, are derived. The optimal rotation angle and energy allocation between displacement and squeezing are obtained in closed form. Furthermore, we show that when both the displacement amplitude and the squeezing strength scale with the total photon number, an effective diversity order of four is achieved. Numerical results validate the analysis and demonstrate the super-diversity behaviour of the proposed QRD scheme.
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