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Soliton Atom Laser via Quantum State Transfer Process

Xiong-Jun Liu, Hui Jing, Mo‐Lin Ge

Published Jun 8, 2004• 0 citations
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Abstract

We theoretically examine quantum state transfer from light to an interacting atomic beam, focusing on generation of soliton atom laser in the output state. This problem is an extension of the Fleischhauer-Gong scheme [M. Fleischhauer and S. Gong, Phys. Rev. Lett. 88, 070404 (2002)] by including the role of nonlinear atomic interactions. The transfer process of quantum state is, however, from photons to created atomic gray-soliton whose dynamics is free of the accompanied frequency chirp effect, indicating a novel scheme for soliton atom laser with nonclassical state.

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•Mar 31, 2005•0 citations
We theoretically examine quantum state transfer from light to an interacting atomic beam, focusing on generation of soliton atom laser in the output state. This problem is an extension of the Fleischhauer-Gong scheme [M. Fleischhauer and S. Gong, Phys. Rev. Lett. 88, 070404 (2002)] by including the role of nonlinear atomic interactions. The transfer process of quantum state is, however, from photons to created atomic gray-soliton whose dynamics is free of the accompanied frequency chirp effect, indicating a novel scheme for soliton atom laser with nonclassical state.
We study the nonlinear effects in the quantum states transfer technique from photons to matter waves in the three-level case, which may provide the formation of a soliton atom laser with nonclassical atoms. The validity of quantum transfer mechanism is confirmed in the presence of the intrinsic nonlinear atomic interactions. The accompanied frequency chirp effect is shown to have no influence on the grey solitons formed by the output atom laser and the possible quantum depletion effect is also briefly discussed.
We theoretically examine the quantum-state transfer process from light to a continuous atom laser by extending the original Fleischhauer-Gong scheme [M. Fleischhauer and S. Gong, 88, 070404 (2002)] to a double-$\ensuremath{\Lambda}$ atomic system. We find that the intensity of the output matter waves is controlled by the relative phase of two coherent probe lights, which may provide an interesting method for the measurement of the initial relative phase of two independent light sources.
We demonstrate complete quantum state transfer of an atomic Bose-Einstein condensate to molecular condensate, mediated by solitonic excitations in a cigar shaped mean-field geometry. Starting with a localized solitonic atomic condensate, we show compatible gray solitonic configuration in the molecular condensate, which results in complete atom-molecule conversion. The effect of inter and intra-species interactions on the formation of molecular condensate is explicated in the presence of Raman Photoassociation. It is found that photoassociation plays a crucial role in the coherent atom-molecule conversion as well as in the soliton dynamics. The gray soliton dispersion reveals bistable behaviour, showing a re-entrant phase in a physically accessible parametric domain.
Two-component entangled atom laser is obtained via quantum state transfer technique from lights to matter waves in a five-level MMM-type system. The considered atom-atom collisions can yield an effective Kerr susceptibility for this system and lead to the self- and cross- phase modulation between the two output atom lasers. This effect results in generation of entangled states of output atom lasers. Particularly, a potential application for a quantum phase gate between two individual atom lasers can be demonstrated for the case that the input quantized probe lights are both in the single-photon state.