Atom localization using Laguerre–Gaussian beams

Abstract

Use of the Laguerre-Gaussian fields in an atom-light interaction makes the linewidth of the optical spectrum narrow. We exploit this fact for providing the ability to accomplish simultaneous ultra-high precision and spatial resolution atom localization in a double-Λ atomic system; Under multi-photon resonance condition, the resolution of the localization is remarkably improved so that the atom can be localized in a region smaller than λ/20 × λ/20. Most prominently, the probability of finding the atom at a particular position is always 100%, when a photon with certain frequencies is absorbed or amplified. Such features are mainly dependent on radial dependence associated with the Laguerre-Gaussian fields in a spatially dependent atom-light interaction.

Identifying orbital angular momentum of light in quantum wells

“…We then consider configurations in which two of driving fields have LG profiles. First, we investigate the situation that two control fields, g It may be of interest to note that a similar term to that obtained in this work, i.e., Im[i e iφ0 g 42 g * 32 ] was the subject of another investigation in an atomic system, as has recently reported by the present authors and their colleague [50]. It was found that utilizing two control vortex beams with equal azimuthal indices, l 42 =l 32 , can permit ultra-high precision and spatial resolution atom localization.…”

Spatial-dependent quantum dot-photon entanglement via tunneling effect

“…LG beam is a form of vortex beam with a helical phase structure and a doughnut-like intensity profile. This beam has recently been employed to narrow the Doppler line-shapes 31 , atom localization 32 , and spatially dependent atom-photon entanglement 33 . Such a beam was also exercised for generating entanglement of the orbital angular momentum states of photons 34 , quantum cryptography 35 , and a free-space quantum key distribution mechanism 36 .…”

Spatial-dependent Quantum Dot-photon Entanglement via Tunneling Effect

“…LG beam is a form of vortex beam with a helical phase structure and a doughnutlike intensity profile. This beam has recently been employed to narrow the Doppler line-shapes [31], atom localization [32], and spatially dependent atom-photon entanglement [33]. Such a beam was also exercised for generating entanglement of the orbital angular momentum states of photons [34], quantum cryptography [35], and a free-space quantum key distribution mechanism [36].…”