Protecting the entanglement of twisted photons by adaptive optics
Protecting the entanglement of twisted photons by adaptive optics
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DOI：
10.1103/physreva.97.012321
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发表时间：
2017-09
影响因子：
2.9
通讯作者：
N. Leonhard;Giacomo Sorelli;V. Shatokhin;C. Reinlein;A. Buchleitner
中科院分区：
文献类型：
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作者：
N. Leonhard;Giacomo Sorelli;V. Shatokhin;C. Reinlein;A. Buchleitner
我们研究了自适应光学（AO）校正纠缠光子轨道角动量（OAM）量子比特态的自由空间传输的效率，以扭转适度的大气湍流失真。我们表明，AO可以显着减少串扰的编码子空间内和外的模式，从而稳定对湍流纠缠。该方法为湍流中的OAM光子建立了可靠的量子信道，并将安全量子通信的阈值湍流强度提高了至少两倍。
We study the efficiency of adaptive optics (AO) correction for the free-space propagation of entangled photonic orbital-angular-momentum (OAM) qubit states, to reverse moderate atmospheric turbulence distortions. We show that AO can significantly reduce crosstalk to modes within and outside the encoding subspace and thereby stabilize entanglement against turbulence. This method establishes a reliable quantum channel for OAM photons in turbulence, and enhances the threshold turbulence strength for secure quantum communication at least by a factor two.