Subwavelength atom localization via coherent manipulation of the Raman gain process

Abstract

We present a simple scheme of atom localization in a subwavelength domain via manipulation of Raman gain process. We consider a four-level system with a pump and a weak probe field. In addition, we apply a coherent field to control the gain process. The system is similar to the one used by Agarwal and Dasgupta ͓Phys. Rev. A 70, 023802 ͑2004͔͒ for the superluminal pulse propagation through Raman gain medium. For atom localization, we consider both pump and control fields to be the standing-wave fields of the cavity. We show that a much precise position of an atom passing through the standing-wave fields can be determined by measuring the gain spectrum of the probe field.

Efficient two-dimensional atom localization via an external coherent magnetic field

“…Instead of the measurement of the population in the upper state, Agarwal and Kapale put forward a scheme of atom localization via the measurement of the population of one of the ground states, which led to only two localization peaks in a unit wavelength region [27]. More recently, unique position information of the atom can be obtained via coherent manipulation of the Raman gain process [28] and Raman-driven coherence [29]. On the other hand, the behaviors of two-dimensional (2D) atom localization in multi-level atomic systems also have been studied in recent years because of its unique properties and extensive applications.…”

Two-Dimensional Atom Localization via Controlled Spontaneous Emission in a Coupled Cavity Waveguide

“…Several simple localization schemes have been proposed using such as the resonance fluorescence in a two-level system, the measurement of Autler-Townes split spontaneous emission in a three-level system, and a three-level -type atom interacting with a classical standing-wave field and a weak probe field [4][5][6]. Furthermore, one-dimensional (1D) atom localization can be achieved in Raman gain atoms [7], and coherent population trapping [8][9][10]. There will be more practical application in two-dimensional (2D) atom localization [11,12], and hence many works have been put forward.…”

Precision position measurement of single atom

“…The authors observed that control of the amplitudes of the driving field provided a strong narrowing line that yielded a better resolution in position measurement of the single atom. In the scheme[12] , a parity violation was considered, and a high field was required to break this violation.In 2009, two different systems were used for the atom localizations [13,14] to observe single position measurement. In the system [13] , a four-level Raman gain process was used for subwavlength atom localization and a single peak was observed for an atom.…”

“…In 2009, two different systems were used for the atom localizations [13,14] to observe single position measurement. In the system [13] , a four-level Raman gain process was used for subwavlength atom localization and a single peak was observed for an atom.…”

“…In the system [13] , a four-level Raman gain process was used for subwavlength atom localization and a single peak was observed for an atom. The other system [14] was basically dependent upon two-photon measurement of the position of a quantum particle in Λ-and M-type systems, and the same behavior was observed for single atom localization.…”