量子纠缠在随机介质中的传输
Transmission of quantum entanglement through a random medium
摘要：
研究了光子对通过随机介质传输时的高维纠缠。我们表明，多重散射与随后的选择只有一小部分的出射模式相结合，减少了初始最大纠缠双光子态的平均纠缠。当透射光中可接近的模数远小于入射光中的模数时，可以得到对应于随机纯态的纠缠态。接近入射光的纠缠量可以通过访问大量的传输模式来恢复。相比之下，一对处于可分离状态的光子在通过随机介质传输时不会获得任何纠缠。
英文摘要：
We study the high-dimensional entanglement of a photon pair transmitted through a random medium. We show that multiple scattering in combination with the subsequent selection of only a fraction of outgoing modes reduces the average entanglement of an initially maximally entangled two-photon state. Entanglement corresponding to a random pure state is obtained when the number of modes accessible in transmission is much less than the number of modes in the incident light. An amount of entanglement approaching that of the incident light can be recovered by accessing a larger number of transmitted modes. In contrast, a pair of photons in a separable state does not gain any entanglement when transmitted through a random medium.
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