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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 7 — Jul. 1, 2012
  • pp: 1690–1696

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

M. de los Angeles Gallego and Miguel Orszag  »View Author Affiliations


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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