## Death and revival of the quantum discord and the measurement-induced disturbance |

JOSA B, Vol. 29, Issue 7, pp. 1690-1696 (2012)

http://dx.doi.org/10.1364/JOSAB.29.001690

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### Abstract

Three different quantifiers, entanglement of formation (ENT), quantum discord (QD), and measurement-induced disturbance (MID), are used to measure the quantum correlations of two qubits in a common squeezed bath. A subspace was found for initial conditions in a squeezed bath, where the system experiences no decoherence. We relate the three measurements with the “distance” from the initial condition to the decoherence free subspace, in order to study the effect of the decoherence in the quantum correlations. We show examples of a system with quantum correlations even when entanglement is null. Furthermore, we study the necessary conditions for the system to become truly classical. We found that, under certain initial conditions and at specific times, the system becomes classical and both the QD and the MID vanish, thus observing the phenomena of sudden death and revival of the quantum correlations. Finally, we observe discontinuities in the QD.

© 2012 Optical Society of America

**OCIS Codes**

(270.6570) Quantum optics : Squeezed states

(270.5585) Quantum optics : Quantum information and processing

**ToC Category:**

Quantum Optics

**History**

Original Manuscript: March 14, 2012

Manuscript Accepted: April 18, 2012

Published: June 19, 2012

**Citation**

M. de los Angeles Gallego and Miguel Orszag, "Death and revival of the quantum discord and the measurement-induced disturbance," J. Opt. Soc. Am. B **29**, 1690-1696 (2012)

http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-7-1690

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