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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Coherently generated of vortex superpositions in Bose-Einstein Condensates and their applications

Kishore T. Kapale, Jonathan P. Dowling

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We present methods for optical excitation of coherent superpositions of vortices in Bose-Einstein Condensates through coupling with orbital angular momentum of light. We discussion applications to quantum information, gyroscopy and generation of Schrödinger Cat states.
DOI
10.1364/qim.2013.w6.05

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We propose a scheme for the generation of arbitrary coherent superpositions of vortex states in Bose-Einstein condensates (BEC) using the orbital-angular-momentum states of light. We devise a scheme to generate coherent superpositions of two such counterrotating states of light using well-known experimental techniques. We show that a specially designed Raman scheme allows for transfer of the optical vortex-superposition state onto an initially nonrotating BEC. This creates an arbitrary and coherent superposition of a vortex and antivortex pair in the BEC. The ideas presented here could be extended to generate entangled vortex states, design memories for the orbital-angular-momentum states of light, and perform other quantum information tasks. Applications to inertial sensing are also discussed.
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We present experimental results on the coherent transfer of orbital angular momentum (OAM) from optical fields to the center-of-mass motion of a Bose-Einstein condensate (BEC), using an approach which results in negligible linear momentum change. Two collinear optical beams of differing OAM are used to couple discrete sublevels of the atomic ground state via a stimulated Raman process. We demonstrate several of the possible optical field configurations which place the BEC into various spinor and vortex states. We also show how this approach can be used to create coherent superpositions of these states and use the interference patterns of such superpositions to confirm the presence of quantized vortices.