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Energy cost of entanglement extraction in complex quantum systems

Title
Energy cost of entanglement extraction in complex quantum systems
Author
Beny, Cedric
Keywords
FIELD-THEORY; ENTROPY; INEQUALITIES; VACUUM; STATES
Issue Date
2018-09
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v. 9, Article no. 3792
Abstract
What is the energy cost of extracting entanglement from complex quantum systems? Operationally, we may wish to actually extract entanglement. Conceptually, we may wish to physically understand the entanglement distribution as a function of energy. This is important, especially for quantum field theory vacua, which are extremely entangled. Here we build a theory to understand the energy cost of entanglement extraction. First, we consider a toy model, and then we define the entanglement temperature, relating energy cost to extracted entanglement. Next, we give a physical argument quantifying the energy cost of entanglement extraction in some quantum field vacua. There the energy cost depends on the spatial dimension: in one dimension, for example, it grows exponentially with extracted entanglement. Next, we provide approaches to bound the energy cost of extracting entanglement more generally. Finally, we look at spin chain models numerically to calculate the entanglement temperature using matrix product states.
URI
https://www.nature.com/articles/s41467-018-06153-whttps://repository.hanyang.ac.kr/handle/20.500.11754/81373
ISSN
2041-1723
DOI
10.1038/s41467-018-06153-w
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > APPLIED MATHEMATICS(응용수학과) > Articles
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