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Dynamic of quantum Fisher information and quantum interferometric power in multipartite coherent states

  • Rachid LaghmachEmail author
  • Hanane El HadfiEmail author
  • Wiam KaydiEmail author
  • Mohammed DaoudEmail author
Regular Article
  • 23 Downloads

Abstract

We examine the role of quantum correlations, contained multipartite Glauber coherent states, in enhancing the precision in the estimation of an unknown phase shift. We give the explicit form of quantum Fisher information in even and odd multipartite coherent states. Two different pairing schemes are considered to evaluate the sensitivity of the probe state to the phase shift for some relevant local Hamiltonians. Also, a particular interest is dedicated to the derivation of the quantum interferometric power which quantifies the amount of non-classical correlations. This quantum correlations quantifier is compared with the original quantum discord built upon von Neumann entropy and we discuss the effects of quantum correlations in quantum metrology protocols. In addition, the dynamics of quantum Fisher information about a dephasing channel is studied. In order to illustrate our results, we examine the situation involving tripartite coherent states to determine the sensitivity of the probe state when the first qubit is driven by an arbitrary local Hamiltonian.

Graphical abstract

Keywords

Quantum Information 

Notes

Author contribution statement

All authors contributed equally to the paper.

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.LPHE-Modeling and Simulation, Faculty of Sciences, University Mohammed VRabatMorocco
  2. 2.Department of PhysicsFaculty of Sciences, University Ibn TofailKenitraMorocco
  3. 3.Abdus Salam International Centre for Theoretical physicsTriesteItaly

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