Adiabatic freezing of long-range quantum correlations in spin chains

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Title: Adiabatic freezing of long-range quantum correlations in spin chains
Authors: Dhar, HS
Rakshit, D
Sen (De), A
Sen, U
Item Type: Journal Article
Abstract: We consider a process to create quasi–long-range quantum discord between the non-interacting end spins of a quantum spin chain, with the end spins weakly coupled to the bulk of the chain. The process is not only capable of creating long-range quantum correlation but the latter remains frozen, when certain weak end-couplings are adiabatically varied below certain thresholds. We term this phenomenon as adiabatic freezing of quantum correlation. We observe that the freezing is robust to moderate thermal fluctuations and is intrinsically related to the cooperative properties of the quantum spin chain. In particular, we find that the energy gap of the system remains frozen for these adiabatic variations, and moreover, considering the end spins as probes, we show that the interval of freezing can detect the anisotropy transition in quantum XY spin chains. Importantly, the adiabatic freezing of long-range quantum correlations can be simulated with contemporary experimental techniques.
Issue Date: 20-Jul-2016
Date of Acceptance: 22-Jun-2016
URI: http://hdl.handle.net/10044/1/72887
DOI: https://doi.org/10.1209/0295-5075/114/60007
ISSN: 0295-5075
Publisher: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Journal / Book Title: EPL
Volume: 114
Issue: 6
Copyright Statement: © EPLA, 2016. This is an author-created, un-copyedited version of an article accepted for publication in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.1209/0295-5075/114/60007.
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
XY-MODEL
STATISTICAL-MECHANICS
MARKOVIAN EVOLUTION
ENTANGLEMENT
DISCORD
STATE
DECOHERENCE
RESOURCE
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
XY-MODEL
STATISTICAL-MECHANICS
MARKOVIAN EVOLUTION
ENTANGLEMENT
DISCORD
STATE
DECOHERENCE
RESOURCE
quant-ph
quant-ph
cond-mat.str-el
01 Mathematical Sciences
02 Physical Sciences
Fluids & Plasmas
Publication Status: Published
Article Number: ARTN 60007
Online Publication Date: 2016-07-20
Appears in Collections:Quantum Optics and Laser Science
Physics



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