2017/09/25 by Etera R. Livine · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1103/physrevd.97.026009
published as Phys. Rev. D 97, 026009 (2018) · 8 pages
arxiv created 2017/09/25 · arxiv updated 2018/01/31
In the context of quantum gravity, we clarify entanglement calculations on spin networks: we distinguish the gauge-invariant entanglement between intertwiners located at the nodes and the entanglement between spin states located on the network's links. We compute explicitly these two notions of entanglement between neighboring nodes and show that they are always related to the typical ln(2j+1) term depending on the spin j living on the link between them. This ln(2j+1) contribution comes from looking at non-gauge invariant states, thus we interpret it as gauge-breaking and unphysical. In particular, this confirms that pure spin network basis states do not carry any physical entanglement, so that true entanglement and correlations in loop quantum gravity comes from spin or intertwiner superpositions.