Question

How does a non-local unitary operator differ from a local one?

Answer 1

I know that entanglement is conserved under local unitary operations, but haven't heard a lot about their non-local counterparts. Recently, I read that a CNOT gate which is unitary, can create entanglement, does that mean it's a non-local operator? What are their properties, how do they differ from local ones, and what effects do they have on states

Answer 2

I know that entanglement is conserved under local unitary operations, but haven't heard a lot about their non-local counterparts. Recently, I read that a CNOT gate which is unitary, can create entanglement, does that mean it's a non-local operator? What are their properties, how do they differ from local ones, and what effects do they have on states.