Influence of periodically modulated cavity field on the generation of atomic-squeezed states

Abstract

We investigate the influence of periodically time-modulated cavity frequency on the generation of atomic squeezed states for a collection of N two-level atoms confined in a non-stationary cavity with a moving mirror. We show that the two-photon character of the field generated from the vacuum state of field plays a significant role in producing the atomic or spin squeezed states. We further show that the maximum amount of persistent atomic squeezing is obtained for the initial cavity field prepared in the vacuum state.

Fifty Years of the Dynamical Casimir Effect

“…In particular, two-level atoms (qubits) were considered in [306,378,[380][381][382]384,386,391,392,394,400,401,403,404,408]. Two two-level atoms were studied in [390,396,405,407], and ensembles of many two-level atoms in [383,385,388,395,397,398,401,406]. Three-level systems were considered in [379,387,389,408].…”

Controllable generation of photons and phonons in a coupled Bose–Einstein condensate-optomechanical cavity via the parametric dynamical Casimir effect

“…The DCE can be explained qualitatively as a particular kind of the parametric amplification of quantum vacuum fluctuations in systems with time-dependent parameters leading to photon generation. In addition to the theoretical investigations on the issue of particle generation via the DCE in a large variety of systems, ranging from cosmology to non-stationary cavity * motazedifard.ali@gmail.com † a dalafi@sbu.ac.ir ‡ mhnaderi@sci.ui.ac.ir § rokni@sci.ui.ac.ir QED [11], various theoretical schemes for practical applications of the DCE have been suggested, including generation of photons with nonclassical properties [12][13][14], generation of atomic squeezed sates [15], generation of multipartite entanglement in cavity networks [16], and generation of EPR quantum steering and Gaussian interferometric power [17]. Most of the schemes proposed until now to realize the DCE can be roughly separated into two categories: (a) the schemes based on the real mechanical motion of boundaries, e.g., mirrors of a cavity, a mechanism referred to as motion-induced DCE (MIDCE) in the literature [18]; and (b) the schemes based on the parametric amplification of vacuum fluctuations in media without moving boundaries, a process which is a kind of imitation of boundary motion and known as parametric DCE (PDCE) [19].…”

“…The DCE can be explained qualitatively as a particular kind of the parametric amplification of quantum vacuum fluctuations in systems with time-dependent parameters leading to photon generation. In addition to the theoretical investigations on the issue of particle generation via the DCE in a large variety of systems, ranging from cosmology to non-stationary cavity QED [11], various theoretical schemes for practical applications of the DCE have been suggested, including generation of photons with nonclassical properties [12][13][14], generation of atomic squeezed sates [15], generation of multipartite entanglement in cavity networks [16], and generation of EPR quantum steering and Gaussian interferometric power [17].…”

Effect of Cavity Losses on Atomic-squeezed States Produced via Time-varying Cavity Frequency

“…Motivated by these interesting developments in this field, we propose a non-stationary cavity quantum electrodynamical (QED) system composed of an elongated cigar-shaped gas of two-level BEC atoms interacting with asingle mode of an optical cavity, with a moving mirror, whose frequency is rapidly modulated in time. The generation of correlated-particle states or atomic-squeezed states for initial vacuum cavity field has already been investigated [1]. Here, we mainly discuss how the cavity dissipation into the system plays a vital role in controlling the spin-squeezingfor initial vacuum cavity field.…”