Realistic Protocol to Measure Entanglement at Finite Temperatures

Cheolhee Han, Yigal Meir, Eran Sela

Research output: Contribution to journalArticlepeer-review

Abstract

It is desirable to relate entanglement of many-body systems to measurable observables. In systems with a conserved charge, it was recently shown that the number entanglement entropy (NEE) - i.e., the entropy change due to an unselective subsystem charge measurement - is an entanglement monotone. Here we derive finite-temperature equilibrium relations between Rényi moments of the NEE, and multipoint charge correlations. These relations are exemplified in quantum dot systems where the desired charge correlations can be measured via a nearby quantum point contact. In quantum dots recently realizing the multichannel Kondo effect we show that the NEE has a nontrivial universal temperature dependence which is now accessible using the proposed methods.

Original languageEnglish
Article number136201
JournalPhysical Review Letters
Volume130
Issue number13
DOIs
StatePublished - 31 Mar 2023

Funding

FundersFunder number
Army Research OfficeW911NF-20-1-0013
Horizon 2020 Framework Programme951541
European Research Council
United States-Israel Binational Science Foundation2016255
Israel Science Foundation154/19

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