# Bit thread Bit threads are proposed as an alternative way to describe the bulk [[0007 RT surface|RT surface]] that tries to make manifest the underlying physical mechanisms of entanglement *in the bulk*. ## Extensions - Lorentzian - [[2021#Pedraza, Russo, Svesko, Weller-Davies]] - [[2022#Headrick, Hubeny]]: covariant - quantum - [[Rolph2021]][](https://arxiv.org/pdf/2105.08072.pdf) - [[2021#Agon, Pedraza]] - [[0006 Higher-derivative gravity|higher-derivative gravity]] - [[HarperHeadrickRolph2018]][](https://arxiv.org/pdf/1807.04294.pdf) - general spacetime - [[2024#Du, Sun]] - relation to [[0292 Partial entanglement entropy|partial entanglement entropy]] - [[2021#Lin, Sun, Zhang]]