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Then

A. Bhattacharyya, T. Takayanagi and K. Umemoto, “Entanglement of Purification in Free Scalar Field Theories,” JHEP 1804
Original
2018
Later among the works it cites.
T. Takayanagi and K. Umemoto, “Entanglement of purification through holographic duality,” Nature Phys. 14
Original
2018
Later among the works it cites.
P. Nguyen, T. Devakul, M. G. Halbasch, M. P. Zaletel and B. Swingle, “Entanglement of purification: from spin chains to holography,” JHEP 1801
2018
Later among the works it cites.
N. Bao and I. F. Halpern, “Holographic Inequalities and Entanglement of Purification,” JHEP 1803
Original
2018
Later among the works it cites.
H. Hirai, K. Tamaoka and T. Yokoya, “Towards Entanglement of Purification for Conformal Field Theories,” PTEP 2018

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2019

Entanglement of purification and disentanglement in CFTs

Guo, Wu-zhong

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We study the entanglement of purification (EoP) of subsystem $A$ and B in conformal field theories (CFTs) stressing on its relation to unitary operations of disentanglement, if the auxiliary subsystem $\tilde{A}$ adjoins $A$ and $\tilde{A}\tilde{B}$ is the complement of $AB$.

We estimate the amount of the disentanglement by using the holographic EoP conjecture as well as the inequality of Von Neumann entropy.
Denote the state that produces the EoP by $|\psi\rangle_M$.
We calculate the variance of entanglement entropy of $A\tilde{A}$ in the state $|\psi(\delta)\rangle:=e^{i\delta H_{\tilde{A}\tilde{B}}}|\psi\rangle_M$.