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Proceedings Article

Photonic time-bin qubit generation with a tripod atomic system

[+] Author Affiliations
D. Aghamalyan

Institute for Physical Research (Armenia)

Yu. Malakyan

Institute for Physical Research (Armenia) and Yerevan State Univ. (Armenia)

Proc. SPIE 7998, International Conference on Laser Physics 2010, 799815 (March 04, 2011); doi:10.1117/12.890874
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From Conference Volume 7998

  • International Conference on Laser Physics 2010
  • Aram V. Papoyan
  • Ashtarak, Armenia | October 12, 2010

abstract

A new method of preparing a single photon in temporally delocalized entangled modes is proposed and analyzed. We show that in a medium of four-level atoms with tripod-level configuration a strong parametric interaction between two one-photon pulses emerges, if the medium was initially prepared in a coherent superposition of the two ground states, while a strong classical field drives the neighbor transition from the third ground state. The analytical solution of Maxwell equations reveals that under the electromagnetically induced transparency (EIT), the quantum fields propagate with significantly small absorption and with different group velocities that leads to their temporal split into well-separated pulses, the amplitudes of which are well controlled by the driving field. The proposed scheme can serve as a robust source of narrow-band one-photon qubits with an entanglement between two temporal modes, not sensitive to losses in atmosphere and in telecommunication waveguides. We show also that in our scheme a controllable degree of temporal entanglement can be achieved.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

D. Aghamalyan and Yu. Malakyan
"Photonic time-bin qubit generation with a tripod atomic system", Proc. SPIE 7998, International Conference on Laser Physics 2010, 799815 (March 04, 2011); doi:10.1117/12.890874; http://dx.doi.org/10.1117/12.890874


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