ICTS:30355

Video URL

Measurement-induced entanglement between quantum spin chains

Measurement-induced entanglement between quantum spin chains

(2024). Measurement-induced entanglement between quantum spin chains. SciVideos. https://youtu.be/o9Tgs5QriyY

Measurement-induced entanglement between quantum spin chains. SciVideos, Nov. 28, 2024, https://youtu.be/o9Tgs5QriyY 

          @misc{ scivideos_ICTS:30355,
            doi = {},
            url = {https://youtu.be/o9Tgs5QriyY},
            author = {},
            keywords = {},
            language = {en},
            title = {Measurement-induced entanglement between quantum spin chains},
            publisher = {},
            year = {2024},
            month = {nov},
            note = {ICTS:30355 see, \url{https://scivideos.org/icts-tifr/30355}}
          }
Masaki Oshikawa
Talk numberICTS:30355
Source RepositoryICTS-TIFR
Collection

Abstract

We discuss the entanglement between two critical spin chains induced by the Bell-state measurements, when each chain was independently in the ground state before the measurement. This corresponds to a many-body version of “entanglement swapping”. We employ a boundary conformal field theory (CFT) approach and describe the measurements as conformal boundary conditions in the replicated field theory. We show that the swapped entanglement exhibits a logarithmic scaling, whose coefficient takes a universal value determined by the scaling dimension of the boundary condition changing operator. We apply our framework to the critical spin-1/2 XXZ chain and determine the universal coefficient by the boundary CFT analysis, which is verified by a numerical calculation.

This talk is based on M. Hoshino, M. O., and Y. Ashida, arXiv:2406.12377