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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Collective Scattering of Partially Coherent Light By Cold Atoms

Gordon R. M. Robb, W. J. Firth

Published Jun 1, 2007• 0 citations
Publisher

Abstract

This paper presents a theoretical investigation of the dynamics of cold atoms in a high-Q optical cavity in the presence of pump phase noise. The influence of pump phase noise on the evolution of the coupled atom-cavity system using a phase diffusion model is also investigated. The behaviour of the system in the limiting cases of coherent pumping (slow phase diffusion) and incoherent pumping (fast phase diffusion) is compared.

DOI
10.1109/cleoe-iqec.2007.4386954

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This paper presents a theoretical investigation of the dynamics of cold atoms in a high-Q optical cavity in the presence of pump phase noise. The influence of pump phase noise on the evolution of the coupled atom-cavity system using a phase diffusion model is also investigated. The behaviour of the system in the limiting cases of coherent pumping (slow phase diffusion) and incoherent pumping (fast phase diffusion) is compared.
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We extend our theory of Bloch oscillations of cold atoms inside an optical cavity [Venkatesh et al., Phys. Rev. A 80, 063834 (2009)] to include the effects of quantum noise arising from coupling to external modes. The noise acts as a form of quantum measurement backaction by perturbing the coupled dynamics of the atoms and the light. We take it into account by solving the Heisenberg-Langevin equations for linearized fluctuations about the atomic and optical mean fields and examine how this influences the signal-to-noise ratio of a measurement of external forces using this system. In particular, we investigate the effects of changing the number of atoms, the intracavity lattice depth, and the atom-light coupling strength, and show how resonances between the Bloch oscillation dynamics and the quasiparticle spectrum have a strong influence on the signal-to-noise ratio, as well as heating effects. One of the hurdles we overcome in this paper is the proper treatment of fluctuations about time-dependent mean fields in the context of cold-atom cavity QED.
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