Entangled particles are created through a process called entanglement, which typically occurs when two or more particles interact in a way that their quantum states become correlated. The exact mechanism by which entanglement arises depends on the specific experimental setup and the nature of the particles involved.
In terms of what entangled particles are made of, they are composed of fundamental particles such as electrons, photons, or atoms. The specific constituents depend on the type of particles being entangled. For example, entangled photons are typically created using a process called parametric down-conversion, where a nonlinear crystal splits incoming photons into two entangled photons known as a photon pair.
When particles are entangled, their quantum states become interconnected, meaning that measurements made on one particle can instantaneously affect the state of the other, regardless of the spatial separation between them. This phenomenon is known as quantum nonlocality.
If one entangled particle is destroyed or moved to another location, the entanglement between the particles is not immediately affected. However, any subsequent measurements made on the remaining entangled particle will no longer exhibit correlation with the destroyed or moved particle. The entanglement is said to be "broken" or "severed" due to the disruption caused by the destruction or relocation. The specific consequences of such disruption depend on the nature of the entanglement and the particles involved.
It's worth noting that entanglement is a complex and fundamental concept in quantum mechanics, and its behavior often defies classical intuition. While the explanation provided here is a simplified overview, a comprehensive understanding of entanglement requires a deeper exploration of quantum physics and its mathematical formalism.