🧐 How do scientists create entangled photons?

✨ One of the most widely used techniques is Spontaneous Parametric Down-Conversion (SPDC).

📝 In this process, a high-energy photon enters a nonlinear crystal and spontaneously splits into two lower-energy photons, known as the signal and idler photons.

☯️ These photon pairs can become entangled, making SPDC a cornerstone of modern quantum optics, quantum communication, and quantum information experiments.


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