Quantum entanglement

The fundamental physics of quantum entanglement were heavily debated by Albert Einstein, Boris Podolsky, and Nathan Rosen in a famous 1935 paper. They referred to it as "spooky action at a distance" because it seemingly violated the principle of locality. The term "entanglement" itself was later coined by physicist Erwin Schrödinger.

Entanglement occurs when two or more quantum particles, such as photons or electrons, interact in such a way that their individual quantum states become mathematically linked. If you measure the state of one particle, you instantaneously know the state of its entangled partner. This correlation persists even if the particles are separated by vast cosmic distances.

No, quantum entanglement cannot be used to transmit information faster than the speed of light. While measuring one particle instantly affects the other, the outcome of the measurement is entirely random. To actually compare the data and understand the correlation, classical communication bound by the speed of light is still required.

Quantum entanglement is the foundational technology behind the rapidly developing fields of quantum computing and quantum cryptography. It enables highly secure communication networks, as any attempt to eavesdrop on an entangled signal would disturb the system and be immediately noticeable. It is also critical in the theoretical development of quantum teleportation.