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Proceedings Paper

Photonic time-bin qubit generation with a tripod atomic system
Author(s): D. Aghamalyan; Yu. Malakyan
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Paper 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.

Paper Details

Date Published: 4 March 2011
PDF: 8 pages
Proc. SPIE 7998, International Conference on Laser Physics 2010, 799815 (4 March 2011); doi: 10.1117/12.890874
Show Author Affiliations
D. Aghamalyan, Institute for Physical Research (Armenia)
Yu. Malakyan, Institute for Physical Research (Armenia)
Yerevan State Univ. (Armenia)

Published in SPIE Proceedings Vol. 7998:
International Conference on Laser Physics 2010
Aram V. Papoyan, Editor(s)

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