کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8202028 | 1529852 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Global quantum discord in matrix product states and the application
ترجمه فارسی عنوان
اختلافات کوانتومی جهانی در حالت های ماتریکس محصول و کاربرد
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کلمات کلیدی
اختلاف کوانتومی جهانی، حالت محصول ماتریکس، زنجیر چرخش انتقال فاز کوانتومی،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک و نجوم (عمومی)
چکیده انگلیسی
Global quantum discord (GQD) is a measure of quantum correlation for multi-site quantum states. In this paper, we propose an efficient procedure to calculate global quantum discord (Gn) for consecutive n-site subsystems in infinite-size matrix product states (MPSs). We apply the method to study the scaling behavior of Gn in several one-dimensional infinite quantum spin chains, i.e., (1) a three-site interaction model whose ground state can be exactly expressed as MPSs, and (2) a spin-12 XXZ chain whose ground state is approximately expressed as MPSs with the help of infinite time-evolving block decimation (iTEBD) algorithm. In both models, as the increase of n, Gn shows an approximately linear growth. Unambiguous clue for the convergence of the incremental ÎGn=GnâGnâ1 is observed when n is large enough. Moreover, in non-critical (gapped) regions ÎGn converges very fast, while in critical (gapless) regions it converges relatively slow. The behaviors are explained in a model-independent physical picture with finite-range correlations. Based on these results, we propose to use “discord per site” (Gnn) to describe the global correlations in infinite-size spin chains. Moreover, we find that the global discord shows a size-independent maximum at the infinite-order quantum phase transition point of the XXZ model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Physics - Volume 359, August 2015, Pages 115-124
Journal: Annals of Physics - Volume 359, August 2015, Pages 115-124
نویسندگان
Zhao-Yu Sun, Yan-E Liao, Bin Guo, Hai-Lin Huang,