Disentangling quantum matter with measurements

Ben-Zion, Daniel; McGreevy, John; Grover, Tarun

doi:10.1103/physrevb.101.115131

Title: Disentangling quantum matter with measurements

Journal Article · Wed Mar 18 00:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.115131· OSTI ID:1801924

Ben-Zion, Daniel ^[1];

^[1]; Grover, Tarun ^[1]

Univ. of California San Diego, La Jolla, CA (United States)

Measurements destroy entanglement. Building on ideas used to study ‘quantum disentangled liquids,’ we explore the use of this effect to characterize states of matter. In this work, we focus on systems with multiple components, such as charge and spin in a Hubbard model or local moments and conduction electrons in a Kondo lattice model. In such systems, measurements of (a subset of) one of the components can leave behind a quantum state of the other that is easy to understand, for example in terms of scaling of entanglement entropy of subregions. We bound the outcome of this protocol, for any choice of measurement, in terms of more standard information-theoretic quantities. We apply this quantum disentangling protocol to several problems of physical interest, including gapless topological phases, heavy fermions, and scar states in the Hubbard model.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0009919; DMR-1752417

OSTI ID:: 1801924

Alternate ID(s):: OSTI ID: 1605459

Journal Information:: Physical Review. B, Vol. 101, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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