Brazilian Journal of Physics

, Volume 47, Issue 2, pp 107–121 | Cite as

A Total Measure of Multi-Particle Quantum Correlations in Atomic Schrödinger Cat States

  • Ram Narayan Deb
Atomic Physics


We propose a total measure of multi-particle quantum correlation in a system of N two-level atoms (N qubits). We construct a parameter that encompasses all possible quantum correlations among N two-level atoms in arbitrary symmetric pure states and define its numerical value to be the total measure of the net atom-atom correlations. We use that parameter to quantify the total quantum correlations in atomic Schrödinger cat states, which are generated by the dispersive interaction in a cavity. We study the variation of the net amount of quantum correlation as we vary the number of atoms from N=2 to N=100 and obtain some interesting results. We also study the variation of the net correlation, for fixed interaction time, as we increase the number of atoms in the excited state of the initial system, and notice some interesting features. We also observe the behaviour of the net quantum correlation as we continuously increase the interaction time, for the general state of N two-level atoms in a dispersive cavity.


Quantum correlation Atomic Schrödinger cat state 


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Copyright information

© Sociedade Brasileira de Física 2017

Authors and Affiliations

  1. 1.Department of PhysicsChandernagore CollegeChandernagore, HooghlyIndia

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