Phase sensitive amplification enabled by coherent population trapping

P. Neveu (1) , C Banerjee , J. Lugani (2) , F. Bretenaker (3) , E. Brion (4) , F. Goldfarb (3)

1 PASTEUR - Processus d'Activation Sélective par Transfert d'Energie Uni-électronique ou Radiatif (UMR 8640)
2 IIT Guwahati - Indian Institute of Technology Guwahati
3 LAC - Laboratoire Aimé Cotton
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

We isolate a novel four-wave mixing process, enabled by coherent population trapping (CPT), leading to efficient phase sensitive amplification. This process is permitted by the exploitation of two transitions starting from the same twofold degenerate ground state. One of the transitions is used for CPT, defining bright and dark states from which ultra intense four-wave mixing is obtained via the other transition. This leads to the measurement of a strong phase sensitive gain even for low optical densities and out-of-resonance excitation. The enhancement of four-wave mixing is interpreted in the framework of the dark-state polariton formalism.

Mots clés: phase sensitive amplification; two-mode squeezing; coherent population trapping; four-wave mixing

Domaines: Physique Quantique [quant-ph]

P. Neveu, C Banerjee, J. Lugani, F. Bretenaker, E. Brion, et al.. Phase sensitive amplification enabled by coherent population trapping. New Journal of Physics, 2018, 20 (8), pp.083043. ⟨10.1088/1367-2630/aadb79⟩. ⟨hal-02107662⟩