Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states

E. Castro; R. Gómez; C. L. Ladera; A. Zambrano

doi:10.1117/12.2021625

18 November 2013 Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states

E. Castro, R. Gómez, C. L. Ladera, A. Zambrano

Author Affiliations +

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87858U (2013) https://doi.org/10.1117/12.2021625
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

Among many applications quantum weak measurements have been shown to be important in exploring fundamental physics issues, such as the experimental violation of the Heisenberg uncertainty relation and the Hardy paradox, and have also technological implications in quantum optics, quantum metrology and quantum communications, where the precision of the measurement is as important as the precision of quantum state preparation. The theory of weak measurement can be formulated using the pre-and post-selected quantum systems, as well as using the weak measurement operator formalism. In this work, we study the quantum discord (QD) of quasi-Werner mixed states based on bipartite entangled coherent states using the weak measurements operator, instead of the projective measurement operators. We then compare the quantum discord for both kinds of measurement operators, in terms of the entanglement quality, the latter being measured using the concept of concurrence. It’s found greater quantum correlations using the weak measurement operators.

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E. Castro, R. Gómez, C. L. Ladera, and A. Zambrano "Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87858U (18 November 2013); https://doi.org/10.1117/12.2021625

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KEYWORDS

Quantum communications

Quantum information

Quantum physics

Quantum optics

Quantum computing

Metrology

Physics

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