Generation of entanglement in systems of intercoupled qubits

Levon Chakhmakhchyan, Claude Leroy, Nerses Ananikian, and Stéphane Guérin
Phys. Rev. A 90, 042324 – Published 20 October 2014

Abstract

We consider systems of two and three qubits, mutually coupled by Heisenberg-type exchange interaction and interacting with external laser fields. We show that these systems allow one to create maximally entangled Bell states, as well as three-qubit Greenberger-Horne-Zeilinger and W states. In particular, we point out that some of the target states are the eigenstates of the initial bare system. Due to this, one can create entangled states by means of pulse area and adiabatic techniques, when starting from a separable (nonentangled) ground state. On the other hand, for target states, not present initially in the eigensystem of the model, we apply the robust stimulated Raman adiabatic passage and π pulse techniques, that create desired coherent superpositions of nonentangled eigenstates.

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  • Received 18 June 2014

DOI:https://doi.org/10.1103/PhysRevA.90.042324

©2014 American Physical Society

Authors & Affiliations

Levon Chakhmakhchyan1,2,3, Claude Leroy1, Nerses Ananikian3, and Stéphane Guérin1

  • 1Laboratoire Interdisciplinaire Carnot de Bourgogne, Unités Mixtes de Recherche, Centre National de la Recherche Scientifique, 6303 Université de Bourgogne, 21078 Dijon Cedex, France
  • 2Institute for Physical Research, 0203 Ashtarak-2, Armenia
  • 3A.I. Alikhanyan National Science Laboratory, Alikhanian Br. 2, 0036 Yerevan, Armenia

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Issue

Vol. 90, Iss. 4 — October 2014

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