Kvanttivälittelyllä

Kvanttivälittelyllä, also known as quantum entanglement, is a phenomenon in quantum mechanics where two or more particles become linked in such a way that they share the same fate, regardless of the distance separating them. When particles are entangled, measuring a property of one particle instantaneously influences the corresponding property of the other particle(s), even if they are light-years apart. This correlation is not due to any classical cause or pre-determined state.

Albert Einstein famously described this "spooky action at a distance" as counter-intuitive, as it seemed to violate the principle that information cannot travel faster than the speed of light. However, numerous experiments have confirmed the existence and validity of quantum entanglement. The state of entangled particles cannot be described independently of each other; they exist as a single quantum system.

The properties that become entangled can include spin, polarization, or momentum. For instance, if two photons are entangled in polarization, measuring the polarization of one photon to be vertical will instantly mean the other photon's polarization is horizontal, or vice versa, depending on the initial entangled state. This interconnectedness is a fundamental aspect of quantum theory and has significant implications for fields such as quantum computing, quantum cryptography, and quantum teleportation. The development of technologies that harness quantum entanglement is an active area of research.