在CMB天空中寻找纠缠光子
Towards Searching for Entangled Photons in the CMB Sky
摘要：
我们探讨了从宇宙微波背景或其他宇宙学源中探测来自两片天空的纠缠光子对的可能性。测量使用具有不同光子偏振器方向的两个探测器。当两个光子源相对于地球分开一个大的角度，使得每个探测器在其视场中只有一个光子源时，可以执行未纠缠光子的零测试。从理论上讲，偏离这种非纠缠背景就是光子纠缠的标志。为了确认这种偏离是否与纠缠光子一致，我们推导了一个光子偏振相关，与贝尔不等式测量中的结果进行了比较。然而，由于光子符合测量不能用于区分未纠缠的宇宙光子，因此不太可能仅通过相关期望值违反贝尔不等式来提供纠缠的签名。
英文摘要：
We explore the possibility of detecting entangled photon pairs from cosmic microwave background or other cosmological sources coming from two patches of the sky. The measurements use two detectors with different photon polarizer directions. When two photon sources are separated by a large angle relative to the earth, such that each detector has only one photon source in its field of view, a null test of unentangled photons can be performed. The deviation from this unentangled background is, in principle, the signature of photon entanglement. To confirm whether the deviation is consistent with entangled photons, we derive a photon polarization correlation to compare with, similar to that in a Bell inequality measurement. However, since photon coincidence measurement cannot be used to discriminate unentangled cosmic photons, it is unlikely that the correlation expectation value alone can violate Bell inequality to provide the signature for entanglement.
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