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Quantum Fisher Information of a 3 × 3 Bound Entangled State and its Relation with Geometric Discord

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Abstract

Recent studies on quantum Fisher information (QFI) have been focused mostly on qubit systems within the context of how entanglement helps surpassing the classical limit of separable states and the limit that a given entangled system can achieve for parameter estimation. However, there are only a few works on bound entangled systems. In this work, we study the QFI of a system of the smallest dimension that bound entanglement can be observed: A bipartite quantum system of two particles of three-levels each. An interesting property of this state is that depending only on a parameter, the state can be separable, bound entangled or free entangled. We show that QFI exhibits a smooth and continues increase with respect to this parameter throughout the transition from separable to bound entangled and from bound entangled to free entangled regions. We show that in any region, this state is not useful for sub-shot noise interferometry. We also relate the QFI of this state with its geometric discord and show how these two properties exhibit a similar behavior throughout this transition.

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  1. Department of Information Technologies, Faculty of Science and Letters, Isik University, Istanbul, Turkey

    Fatih Ozaydin

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  1. Fatih Ozaydin
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Correspondence to Fatih Ozaydin.

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Ozaydin, F. Quantum Fisher Information of a 3 × 3 Bound Entangled State and its Relation with Geometric Discord. Int J Theor Phys 54, 3304–3310 (2015). https://doi.org/10.1007/s10773-015-2570-x

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