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In this note, we describe how collections of arbitrary numbers of "BC-bits,"distinct non-interacting quantum systems each consisting of a holographicboundary conformal field theory (BCFT), can be placed in multipartite entangledstates in order to encode single connected bulk spacetimes that approximategeometries dual to holographic CFT states. The BC-bit version of a holographicCFT state corresponds to a geometry that can be made arbitrarily similar to theassociated CFT-state geometry within a "causal diamond" region defined bypoints that are spacelike separated from the boundary time slice at which thestate is defined. These holographic multi BC-bit states can be well-representedby tensor networks in which the individual tensors are associated with statesof small numbers of BC-bits.

Building up spacetime with quantum entanglement II: It from BC-bit