Unitary-projective entanglement dynamics

Understand

Starting from a state of low quantum entanglement, local unitary time evolution increases the entanglement of a quantum many-body system.

• In contrast, local projective measurements disentangle degrees of freedom and decrease entanglement.
• We study the interplay of these competing tendencies by considering time evolution combining both unitary and projective dynamics.
• We begin by constructing a toy model of Bell pair dynamics which demonstrates that measurements can keep a system in a state of low (i.e.