Generation of entanglement in quantum parametric oscillators using phase control

Year: 2015

Authors: Gonzalez-Henao J. C., Pugliese E., Euzzor S., Abdalah S.F., Meucci R., Roversi J. A.

Autors Affiliation: Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, São Paulo, Brazil
Istituto Nazionale di Ottica-CNR Largo E. Fermi 6, 50125 Firenze, Italy;
Dipartimento di Scienze della Terra – Università degli Studi di Firenze, Via G. La Pira 4, Firenze, Italy

Abstract: The control of quantum entanglement in systems in contact with environment plays an important role in information processing, cryptography and quantum computing. However, interactions with the environment, even when very weak, entail decoherence in the system with consequent loss of entanglement. Here we consider a system of two coupled oscillators in contact with a common heat bath and with a time dependent oscillation frequency. The possibility to control the entanglement of the oscillators by means of an external sinusoidal perturbation applied to the oscillation frequency has been theoretically explored. We demonstrate that the oscillators become entangled exactly in the region where the classical counterpart is unstable, otherwise when the classical system is stable, entanglement is not possible. Therefore, we can control the entanglement swapping from stable to unstable regions by adjusting amplitude and phase of our external controller. We also show that the entanglement rate is approximately proportional to the real part of the Floquet coefficient of the classical counterpart of the oscillators. Our results have the intriguing peculiarity of manipulating quantum information operating on a classical system.


Volume: 5      Pages from: 13152-1  to: 13152-9

More Information: The authors wish thank Prof. F.T. Arecchi for helpful discussion and revision of the manuscript. R.M. also thanks Fondazione Ente Cassa di Risparmio di Firenze for financial support. This work was supported by Capes (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior). We thank also the finacial support by CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico – INCT of Quantum Information), FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo – CePOF of Optics and Photonics).
KeyWords: Separability criterion; Systems
DOI: 10.1038/srep13152

Citations: 10
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