# Is entanglement decoherence from the outside, and decoherence entanglement from the inside?

A recent tweet by Sean Carroll has me thinking. https://twitter.com/seanmcarroll/status/1204128666273271808 Quantum decoherence is said to occur when a particular quantum system becomes entangled with its environment, that is to say, as information about the quantum system spreads throughout the environment, that system undergoes at least an apparent wave function collapse.  It stops behaving like a … Continue reading Is entanglement decoherence from the outside, and decoherence entanglement from the inside?