Spin Squeezing by means of Driven Superradiance

Abstract

We discuss the possibility of generating spin squeezed states by means of driven superradiance, analytically affirming and broadening the finding in [Phys. Rev. Lett. 110, 080502 (2013)]. In an earlier paper [Phys. Rev. Lett. 112, 140402 (2014)] the authors determined that spontaneous purely-dissipative Dicke model superradiance failed to generate any entanglement over the course of the system's time evolution. In this article we show that by adding a driving field, however, the Dicke model system can be tuned to evolve toward an entangled steady state. We discuss how to optimize the driving frequency to maximize the entanglement. We show that the resulting entanglement is fairly strong, in that it leads to spin squeezing.

arXiv comment5+5 pages, 3 color figures. Changed to acknowledge the precedents set by González-Tudela and Porras. Factor of 1/2 added to driving potential. Comments on how to optimize the resulting entanglement (Fig. 3). New discussion regarding variants of the spin squeezing parameter and a comment on the class of the observed entanglement (Appendix C). Many additional references. Figures redone for print

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