  In this paper we present a concept of quantum entanglement in time in a
context of entangled consistent histories. These considerations are supported
by presentation of necessary tools closely related to those acting on a space
of spatial multipartite quantum states. We show that in similarity to monogamy
of quantum entanglement in space, quantum entanglement in time is also endowed
with this property for a particular history. Basing on these observations, we
discuss further bounding of temporal correlations and derive analytically the
Tsirelson bound implied by entangled histories for the Leggett-Garg
inequalities.
