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Ultrahigh-Q toroidal microresonators for cavity quantum electrodynamics

Spillane, S. M. and Kippenberg, T. J. and Vahala, K. J. and Goh, K. W. and Wilcut, E. and Kimble, H. J. (2005) Ultrahigh-Q toroidal microresonators for cavity quantum electrodynamics. Physical Review A, 71 (1). Art. No. 013817. ISSN 1050-2947. http://resolver.caltech.edu/CaltechAUTHORS:SPIpra05

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Abstract

We investigate the suitability of toroidal microcavities for strong-coupling cavity quantum electrodynamics (QED). Numerical modeling of the optical modes demonstrate a significant reduction of the modal volume with respect to the whispering gallery modes of dielectric spheres, while retaining the high-quality factors representative of spherical cavities. The extra degree of freedom of toroid microcavities can be used to achieve improved cavity QED characteristics. Numerical results for atom-cavity coupling strength g, critical atom number No, and critical photon number no for cesium are calculated and shown to exceed values currently possible using Fabry-Perot cavities. Modeling predicts coupling rates g/2π exceeding 700 MHz and critical atom numbers approaching 10^(-7) in optimized structures. Furthermore, preliminary experimental measurements of toroidal cavities at a wavelength of 852 nm indicate that quality factors in excess of 108 can be obtained in a 50-µm principal diameter cavity, which would result in strong-coupling values of (g/(2π),n(0),N-0) = (86 MHz, 4.6 x 10^(-4), 1.0 x 10^(-3)).


Item Type:Article
Additional Information:©2005 The American Physical Society. Received 27 August 2004; published 26 January 2005. The work of K.J.V. was supported by DARPA, the Caltech Lee Center, and the National Science Foundation. The work of H.J.K. was supported by the National Science Foundation, by the Caltech MURI Center for Quantum Networks, by the Advanced Research and Development Activity, and by the California Institute of Technology.
Subject Keywords:quantum optics; atom optics; quantum electrodynamics; caesium; numerical analysis; whispering gallery modes; microcavities
Record Number:CaltechAUTHORS:SPIpra05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SPIpra05
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.71.013817
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5249
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Oct 2006
Last Modified:26 Dec 2012 09:04

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