Nonergodic classical correlations lead to ergodic quantum correlations in low-dimensional spin models
Harish-Chandra Research Institute, Chhatnag Road - Jhunsi, Allahabad 211019, India
Received: 27 March 2013
Accepted: 16 April 2013
Quantum correlations are traditionally viewed as constituted out of classical correlations and single-party parameters. While this, of course, remains so, we show that entanglement can have statistical mechanical properties like ergodicity, which are not inherited from the corresponding classical correlations and single-party parameters, in diagonalizable as well as nondiagonalizable low-dimensional quantum spin systems. In particular, we find that the results hold for the quantum XY spin models on the chain, ladder and in two dimensions.
PACS: 03.67.-a – Quantum information / 05.30.-d – Quantum statistical mechanics / 75.10.Jm – Quantized spin models, including quantum spin frustration
© EPLA, 2013