Eur. Phys. J. D 42, 475-481 (2007)
https://doi.org/10.1140/epjd/e2007-00042-8

Atomic squeezing in assembly of two two-level atoms interacting with a single mode coherent radiation

¹ Department of Physics, University of Allahabad, Allahabad, 211 002, India
² M. N. Saha Centre of Space Studies, Institute of Interdisciplinary Studies, University of Allahabad, Allahabad, 211 002, India
³ Department of Physics, Udai Pratap Autonomous College, Varanasi, 221 002, India

Corresponding authors: ^a Prakash_hari123@rediffmail.com - ^b r_rkumar123@rediffmail.com

Received: 1 September 2006
Revised: 27 January 2007
Published online: 28 February 2007

Abstract

Saito and Ueda [Phys. Rev. A 59, 3959 (1999)] studied atomic and radiation squeezing in interaction of a single mode coherent state of radiation with two excited two-level atoms, using the Jaynes Cummings Hamiltonian. They considered α real and studied squeezing of the Dicke operator S_x using the Kitagawa-Ueda criterion for squeezing and coupling times less than or nearly equal to . We obtain results to all orders in coupling time for atoms, which are initially in (i) fully excited, (ii) superradiant or in (iii) ground states and obtain more general results. We use our recently reported criterion for atomic squeezing, of which the Kitagawa-Ueda criterion is a special case, and obtain a much stronger (nearly 95%) atomic squeezing than that (nearly 1.1%) reported by Saito and Ueda.