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Unitary Transform and Subadditivity Condition for Composite and Noncomposite Systems

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Journal of Russian Laser Research Aims and scope

Abstract

We study quantum correlations on the example of a bipartite system of two qubits. The system is described by the density matrix corresponding either to the Werner state or a generic X state. Also we study an analogous density matrix for the single-qudit state of a four-level atom. We perform the global unitary transform, calculate the quantum mutual information, and investigate its dependence on the parameters of the unitary matrix. Also we discuss the process of transforming a separable state into the entangled state for the composite system of two qubits and a single qudit.

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology (State University), Institutskií per. 9, Dolgoprudnyí, Moscow Region, 141700, Russia

    Ashot S. Avanesov

  2. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii Prospect 53, Moscow, 119991, Russia

    Ashot S. Avanesov & Vladimir I. Man’ko

  3. Physics Department, Tomsk State University, Lenin Avenue 36, Tomsk, 634050, Russia

    Vladimir I. Man’ko

Authors
  1. Ashot S. Avanesov
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  2. Vladimir I. Man’ko
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Correspondence to Ashot S. Avanesov.

Additional information

Manuscript submitted by the authors in English first on June 11, 2015 and in final form on August 2, 2015.

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Avanesov, A.S., Man’ko, V.I. Unitary Transform and Subadditivity Condition for Composite and Noncomposite Systems. J Russ Laser Res 36, 430–439 (2015). https://doi.org/10.1007/s10946-015-9520-1

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  • DOI: https://doi.org/10.1007/s10946-015-9520-1

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