Role of an information-theoretic measure of quantum correlation in a dynamical phase transition of entanglement

Himadri Shekhar Dhar; Rupamanjari Ghosh; Aditi Sen(De); Ujjwal Sen

doi:10.1117/12.900324

23 August 2011 Role of an information-theoretic measure of quantum correlation in a dynamical phase transition of entanglement

Himadri Shekhar Dhar, Rupamanjari Ghosh, Aditi Sen(De), Ujjwal Sen

Author Affiliations +

Proceedings Volume 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics; 81731P (2011) https://doi.org/10.1117/12.900324
Event: International Conference on Fiber Optics and Photonics, 2010, Guwahati, India

Abstract

The nearest-neighbor entanglement of the evolved state of an asymmetric quantum XY spin chain, in a transverse time-dependent field, exhibits criticalities (dynamical phase transitions) as the initial field parameter is varied at a given fixed time. After a discussion of the dynamical phase transition, we investigate the extent to which the role of an information-theoretic quantum correlation measure, called quantum discord, can be used to understand the entanglement dynamics in this spin model. We show that quantum discord can be associated with the collapse and revival of nearest-neighbor entanglement exhibited in the critical behavior. This behavior of quantum discord leads to the broader question of whether certain classes of measures of nonclassical correlation can help to understand the non-generic features of entanglement in a given system.

Citation Download Citation

Himadri Shekhar Dhar, Rupamanjari Ghosh, Aditi Sen(De), and Ujjwal Sen "Role of an information-theoretic measure of quantum correlation in a dynamical phase transition of entanglement", Proc. SPIE 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics, 81731P (23 August 2011); https://doi.org/10.1117/12.900324

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